Validate image tags to contain required tags for plugin

Add method check_required_image_tags to validations/base.py which checks image tags to containing required tags
Add validation required tags for default image to cluster create validation and cluster create template validation
Add unit tests for this methods

Fixes: bug #1204410

Change-Id: Iff80057106fc73fc5f29b5a1f983f99b33840b73
(cherry picked from commit af19c04d5d94a557c71bce919404518fc2e86c5c)