Refactor to use connectors' info declared in setup_mysql

tests/integration/targets/test_mysql_user/tasks/issue-121.yml

@@ -9,8 +9,6 @@
   block:
 
     # ============================================================
-    - shell: pip show pymysql | awk '/Version/ {print $2}'
-      register: pymysql_version
 
     - name: get server certificate
       copy:

tests/integration/targets/test_mysql_user/tasks/test_user_plugin_auth.yml

@@ -356,10 +356,6 @@
     # plugins that are loaded by default are sha2*, but these aren't compatible with pymysql < 0.9, so skip these tests
     # for those versions.
     #
-    - name: Get pymysql version
-      shell: pip show pymysql | awk '/Version/ {print $2}'
-      register: pymysql_version
-
     - name: Test plugin auth switching which doesn't work on pymysql < 0.9
       when:
         - >