test RBAC menu access based on default LDAP group roles

test RBAC menu access based on default LDAP group roles
updated data and credentials templates
fixed port validation rhev vs vsphere

added rhevm31 to test param
removed add mgmt system in favor of conftest fixture to inject dependency

consolidated pytest fixtures
Merge pull request #34 from aweiteka/ldap_rbac_roles

test RBAC menu access based on default LDAP group roles