vmware: use hostname in esxi_hostname

The use of the `hostvars[esxi1].ansible_host` was attempt to use
different hostname and IP address. But it's actually the source of
more problems.

VMware expects to be able to resolvable the host name. This means, that
if someone wants to run the test-suite, s/he needs to use a DNS or
update the `/etc/hosts` files on the different hosts.

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

@@ -15,7 +15,7 @@
         username: '{{ vcenter_username }}'
         password: '{{ vcenter_password }}'
         validate_certs: False
-        esxi_hostname: '{{ hostvars[esxi1].ansible_host }}'
+        esxi_hostname: '{{ esxi1 }}'
         kernel_module_name: "tcpip4"
         kernel_module_option: "ipv6=0"
       register: my_results_01
@@ -23,8 +23,8 @@
     - name: Check that the provided kernel_module_name has kernel_module_option set
       assert:
         that:
-          - "'original_options' in my_results_01['ansible_module_results']['{{ hostvars[esxi1].ansible_host }}']"
-          - "my_results_01['ansible_module_results']['{{ hostvars[esxi1].ansible_host }}'].original_options == 'ipv6=0'"
+          - "'original_options' in my_results_01['ansible_module_results']['{{ esxi1 }}']"
+          - "my_results_01['ansible_module_results']['{{ esxi1 }}'].original_options == 'ipv6=0'"
 
     - name: host connected, module exists, same options for idempotence test
       vmware_host_kernel_manager:
@@ -32,7 +32,7 @@
         username: '{{ vcenter_username }}'
         password: '{{ vcenter_password }}'
         validate_certs: False
-        esxi_hostname: '{{ hostvars[esxi1].ansible_host }}'
+        esxi_hostname: '{{ esxi1 }}'
         kernel_module_name: "tcpip4"
         kernel_module_option: "ipv6=0"
       register: my_results_02