Add make validation to Makefile

- make should validate content during builds and fail if there is an issue
Update Makefile

- Add Fedora targets
- Disable validation for RHEL 7 until ready
Update Makefile

Add global validate to validate all targets and specific targets.
Update Makefile

Remove use of validate-* targets
Update Makefile

- Remove trailing whitespace
- Add target dependencies to validate target
- Disable RHEL7, Openstack, and RHEV until content validates correctly
Merge pull request #35 from redhatrises/add_validate_make

Add make validation to Makefile