Allows accepting modified (UUID) redhat-manifest

Add a task to setup a fake manifest certificate and restart tomcat.
Fix call to setup_fake_manifest_certificate task

Call setup_fake_manifest_certificate task using execute and passing the
host argument to run on the provisioned machine and not in the
provisioning server.
Add RHEL7 support for upstream installation
Merge pull request #27 from elyezer/rhel7-upstream-support

Add RHEL7 support for upstream installation
Try to subscribe to a pool 3 times

Subscribing to a pool sometimes fails due to a race condition.  With
this change, the process happens 3 times before failing. And continue
normally as soon as the command works.
Merge pull request #28 from elyezer/subscribe-pool-retries

Try to subscribe to a pool 3 times
Merge branch 'master' of github.com:omaciel/automation-tools
Added task to install Satellite 6 from CDN.