Add filter module base, prepare adding filters (#553)

* Improve string handling.

* Cleanup tests.

* Add filter module mock.

tests/integration/targets/openssl_publickey_info/tasks/main.yml

@@ -42,10 +42,6 @@
     - 3
     - 4
 
-- name: Prepare result list
-  set_fact:
-    info_results: {}
-
 - name: Running tests with cryptography backend
   include_tasks: impl.yml
   vars:

tests/integration/targets/x509_crl/tasks/impl.yml

@@ -54,7 +54,7 @@
     path: '{{ remote_tmp_dir }}/ca-crl1.crl'
   register: crl_1_info_1
 
-- name: ({{select_crypto_backend}}) Read ca-crl1.crl
+- name: Read ca-crl1.crl
   slurp:
     src: '{{ remote_tmp_dir }}/ca-crl1.crl'
   register: slurp
@@ -110,7 +110,7 @@
         revocation_date: 20191001000000Z
   register: crl_1_idem
 
-- name: ({{select_crypto_backend}}) Read file
+- name: Read file
   slurp:
     src: '{{ remote_tmp_dir }}/{{ item }}'
   loop:
@@ -692,4 +692,4 @@
             - Ed448
           ignore_errors: yes
 
-  when: select_crypto_backend == 'cryptography' and cryptography_version.stdout is version('2.6', '>=')
+  when: cryptography_version.stdout is version('2.6', '>=')

tests/integration/targets/x509_crl/tasks/main.yml

@@ -85,13 +85,9 @@
   register: certificate_infos
 
 - block:
-  - name: Running tests with cryptography backend
+  - name: Running tests
     include_tasks: impl.yml
-    vars:
-      select_crypto_backend: cryptography
 
   - import_tasks: ../tests/validate.yml
-    vars:
-      select_crypto_backend: cryptography
 
   when: cryptography_version.stdout is version('1.2', '>=')

tests/integration/targets/x509_crl/tests/validate.yml

@@ -189,7 +189,7 @@
       - ed25519_ed448_crl.results[1] is failed
       - ed25519_ed448_crl_idempotence.results[0] is failed
       - ed25519_ed448_crl_idempotence.results[1] is failed
-  when: select_crypto_backend == 'cryptography' and cryptography_version.stdout is version('2.6', '>=') and cryptography_version.stdout is version('2.8', '<') and ed25519_ed448_privatekey is not failed
+  when: cryptography_version.stdout is version('2.6', '>=') and cryptography_version.stdout is version('2.8', '<') and ed25519_ed448_privatekey is not failed
 
 - name: Verify Ed25519 and Ed448 tests (for cryptography >= 2.8)
   assert:
@@ -200,4 +200,4 @@
       - ed25519_ed448_crl_idempotence is succeeded
       - ed25519_ed448_crl_idempotence.results[0] is not changed
       - ed25519_ed448_crl_idempotence.results[1] is not changed
-  when: select_crypto_backend == 'cryptography' and cryptography_version.stdout is version('2.8', '>=') and ed25519_ed448_privatekey is not failed
+  when: cryptography_version.stdout is version('2.8', '>=') and ed25519_ed448_privatekey is not failed