Fix ansible-lintreported errors and update syntax in lamp_simple_rhel7.

[jcsmith]

There is still one error reported by ansible-lint for the files in this directory:

$ ansible-lint site.yml 
[ANSIBLE0004] Git checkouts must contain explicit version
/Users/jsmith39/src/external/jcsmith_ansible-examples/lamp_simple_rhel7/roles/web/tasks/copy_code.yml:5
Task/Handler: Copy the code from repository

Specifying version: head to the git module did not seem to resolve the error so I'm not sure what to do about it and am open to suggestions.