pool.pp: add new define ceph::pool

Added new ceph::pool to manage pools. Currently these actions are supported:
- create a new pool
- delete an existing pool from the cluster (BE CAREFULLY WITH THIS!)

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
ceph::pool: add support to increase the PGs ang PGPs of a pool

Added new parameter to ceph::pool to increase the PG and PGP num:
- $increase_pg_num (defaults to false)
- $increase_pgp_num (defaults to false)

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
README.rst: add hint on how to run the rspec tests

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
ceph::conf: add support for 'mon osd (near)full ratio'

Added new optional parameter to ceph::conf:
- mon_osd_full_ratio
- mon_osd_nearfull_ratio

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
rspec: fix typo in describe/context

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>