VMware: Modifying Rest Client to use vSphere-Api-Client instead of individual service(#55804)

* Same api client can be used for other service as well 
* Incorporated Review comments. Modified Category and Guest Fact modules which are also dependent on vmware_rest_client module util
* Adding Integration Tests for vmware_rest_client changes
* Changes to incroporate changes in vcsim testware
* Change to get vm name to attach the tag

test/integration/targets/vmware_tag/aliases

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+cloud/vcenter
+unsupported

test/integration/targets/vmware_tag/tasks/main.yml

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+# Test code for the vmware_tag Operations.
+# Copyright: (c) 2019, Pavan Bidkar <pbidkar@vmware.com>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+- include: tag_crud_ops.yml
+- include: tag_manager_ops.yml 

test/integration/targets/vmware_tag/tasks/tag_crud_ops.yml

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+# Test code for the vmware_tag CRUD Operations.
+# Copyright: (c) 2019, Pavan Bidkar <pbidkar@vmware.com>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+- when: vcsim is not defined
+  block:
+
+    # Testcase Create Category
+    - name: Create Category
+      vmware_category:
+        hostname: '{{ vcenter_hostname }}'
+        username: '{{ vcenter_username }}'
+        password: '{{ vcenter_password }}'
+        validate_certs: False
+        category_name: Sample_Cat_0006
+        category_description: Sample Description
+        category_cardinality: 'multiple'
+        state: present
+      register: category_create
+
+    - name: Check Category is created
+      assert:
+        that:
+          - category_create.changed
+
+    - name: Set Cat_ID Paramter. Required for Tag creation
+      set_fact: Cat_ID={{ category_create['category_results']['category_id'] }}
+
+    # Testcase Create Tag
+    - name: Create a tag
+      vmware_tag:
+        hostname: '{{ vcenter_hostname }}'
+        username: '{{ vcenter_username }}'
+        password: '{{ vcenter_password }}'
+        validate_certs: no
+        tag_name: Sample_Tag_0001
+        category_id: "{{ Cat_ID }}"
+        tag_description: Sample Description
+        state: present
+      register: tag_creation
+
+    - name: Check tag is created
+      assert:
+        that:
+          - tag_creation.changed
+
+    # Testcase Update Tag Description (reconfig)
+    - name: Update Tag Description
+      vmware_tag:
+        hostname: '{{ vcenter_hostname }}'
+        username: '{{ vcenter_username }}'
+        password: '{{ vcenter_password }}'
+        validate_certs: no
+        tag_name: Sample_Tag_0001
+        tag_description: Some fancy description
+        state: present
+      register: update_tag_desc
+
+    - name: Check tag description updated
+      assert:
+        that:
+          - update_tag_desc.changed
+
+    # Testcase Delete the Tag
+    - name: Delete Tag
+      vmware_tag:
+        hostname: '{{ vcenter_hostname }}'
+        username: '{{ vcenter_username }}'
+        password: '{{ vcenter_password }}'
+        validate_certs: no
+        tag_name: Sample_Tag_0001
+        state: absent
+      register: delete_tag
+
+    - name: Check Tag is Deleted
+      assert:
+        that:
+          - delete_tag.changed

test/integration/targets/vmware_tag/tasks/tag_manager_ops.yml

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+# Test code for the vmware_tag Manager Operations.
+# Copyright: (c) 2019, Pavan Bidkar <pbidkar@vmware.com>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+- when: vcsim is not defined
+  block:
+
+    # Get VM name to attach the tag
+    - name: Get VM Facts
+      vmware_vm_facts:
+        hostname: '{{ vcenter_hostname }}'
+        username: '{{ vcenter_username }}'
+        password: '{{ vcenter_password }}'
+        validate_certs: False
+      register: vm_facts
+
+    - set_fact: vm_name="{{ vm_facts['virtual_machines'][0]['guest_name'] }}"
+
+    # Get Tagname
+    - name: Get facts about tag
+      vmware_tag_facts:
+        hostname: '{{ vcenter_hostname }}'
+        username: '{{ vcenter_username }}'
+        password: '{{ vcenter_password }}'
+        validate_certs: False
+      register: tag_facts
+
+    - set_fact: Tag_Name={{ tag_facts['tag_facts'].keys() | list }}
+
+    - debug: var=Tag_Name
+
+    # Testcase Assign tag to virtual Machine
+    - name: Add tags to a virtual machine
+      vmware_tag_manager:
+        hostname: '{{ vcenter_hostname }}'
+        username: '{{ vcenter_username }}'
+        password: '{{ vcenter_password }}'
+        validate_certs: no
+        tag_names:
+          - "{{ Tag_Name[0] }}"
+        object_name: "{{ vm_name }}"
+        object_type: VirtualMachine
+        state: add
+      register: tag_manager_ops
+
+    - name: Check Category is created
+      assert:
+        that:
+          - tag_manager_ops.changed"