Added jenkins build scripts

Restructured the jenkins directory so that it contains both images
and scripts. The "scripts" directory will contain scripts that are
to be executed by Jenkins build jobs.
Build scripts updates
Fix SSH key not getting installed
Preserve build-supplied environment
Set correct permissions for jenkins home
Prevent need to checkout everything
Switch rpmfab repository
Updated mock logging config and misc

* Added logging config to mock so that it will display build output in the
  console output view in Jenkins
* Add SSH configuration to root user (temporary workaround)
Fix some shell variable expansion
Fix eval and perms for jenkins sudo
Updated builder to centos 6.4 and added jinja2 package
Increase partition size for added packages
Fixed time sync with ntpdate and downgraded to centos 6.3

There's a bug in the current centos 6.4 kernel that causes
flock operations on the NFS mount to hang. This means we can't
run createrepo. Fail.
Merge pull request #9 from mspaulding06/jenkins-build-scripts

Jenkins build scripts