contint: consitent indent in manifest/role/ci.pp

The manifest used a mix of 2/4 spaecs for indentation.
Normalize to 4 spaces.

Change-Id: I5c6bac5cc9ec829085f0c26cf5ad245643c94c9e
contint: mount lvm disk for eqiad slaves

The contint slaves in labs make use of /dev/vdb mounted at /mnt. It
fulfill a few needs:

- does not depend on pmtpa GlusterFS
- isolate the user homedir between instances
- provide moaaar disk space
- avoid filling the system partition

On eqiad the additional disk space is created with the labs_lvm class.
This patch mount the additional space at /mnt as a
convenience/back-compatibility.

Change-Id: I049ed4dc5d26d4869f01cec94a154ba0a1d77494
Merge changes I049ed4dc,I5c6bac5c into production

* changes:
  contint: mount lvm disk for eqiad slaves
  contint: consitent indent in manifest/role/ci.pp