Add simple integration test for openssl_certificate (#29038)

* openssl_certificate: Fix parameter assertion in Python3

Parameter assertion in Python3 is broken. pyOpenSSL get_X() functions
returns b'' type string and tries to compare it with '' string, leading
to failure.

The error mentionned above has been fixed by sanitizing the inputs from
a user to the assert only backend.

Also, this error was hidden by the fact that the improper check method
was called in the generate() functions.

* Add simple integration test for openssl_certificate

* remove subject == issuer assertion

* run integration tests only on supported hosts

* change min supported version to 0.15.x

* Add test for more CSR fields

* also convert dict members to bytes

* fix version_compare

* openssl_{csr, certificate}: Fail if pyOpenSSL <= 0.15

Previous 0.13 pyOpenSSL was a C-binding, and required the parameter
passed to add_extention to be in ASN.1. This has changed with the move
to 0.14 and it is now all pythong and string based.

Previous the 0.15 release, the `get_extensions()` method didn't exist,
since the modules rely heavily on it we ensure pyOpenSSL version is at
last 0.15.0.

* check pyopenssl version in openssl_csr integration test

test/integration/targets/openssl_certificate/tests/validate.yml

@@ -0,0 +1,25 @@
+- name: Validate certificate (test - privatekey modulus)
+  shell: 'openssl rsa -noout -modulus -in {{ output_dir }}/privatekey.pem | openssl md5'
+  register: privatekey_modulus
+
+- name: Validate certificate (test - certificate modulus)
+  shell: 'openssl x509 -noout -modulus -in {{ output_dir }}/cert.pem | openssl md5'
+  register: cert_modulus
+
+- name: Validate certificate (assert)
+  assert:
+    that:
+      - cert_modulus.stdout == privatekey_modulus.stdout
+
+- name: Validate certificate2 (test - privatekey modulus)
+  shell: 'openssl rsa -noout -modulus -in {{ output_dir }}/privatekey2.pem | openssl md5'
+  register: privatekey2_modulus
+
+- name: Validate certificate2 (test - certificate modulus)
+  shell: 'openssl x509 -noout -modulus -in {{ output_dir }}/cert2.pem | openssl md5'
+  register: cert2_modulus
+
+- name: Validate certificate2 (assert)
+  assert:
+    that:
+      - cert2_modulus.stdout == privatekey2_modulus.stdout