Move module dependency functions outside of module (#342)

Move module dependency functions outside of module

SUMMARY

This moves the has_at_least and requires functions that had been on the
module to top level functions. The functions on the module now call
these with a few added bits of functionality.
Moving these functions to the top level and removing their requirement
on having a module makes them usable in situations where we may not yet
have a module, such as during client creation.

ISSUE TYPE

COMPONENT NAME

ADDITIONAL INFORMATION

Reviewed-by: Alina Buzachis <None>
Reviewed-by: None <None>

tests/integration/targets/k8s_validate/tasks/main.yml

@@ -201,7 +201,7 @@
         - name: assert that task failed with proper message
           assert:
             that:
-              - '"kubernetes >= 17.17.0 is required" in _result.module_stderr'
+              - '"This is required to use in-memory config." in _result.msg'
       when:
         - _stat.stat.exists
         - _stat.stat.readable