Ceilometer install: ensure keystone authentication

Make sure that the auth_strategy option is set to keystone during
ceilometer installation.

Change-Id: I6be4f9ac741e29169792874df857a7e51f0e3289
Closes-Bug: #1310801
Document INI format for Config Reference

Document the format of OpenStack configuration files - INI format.

Add an entry to the glossary for INI.

Change-Id: I4d0e16b36d1e261b223b3f842dbdac5fcfa770ab
Closes-Bug: #1310457
Imported Translations from Transifex

Change-Id: If0d02307f269ab5d03c2902e0d0030a2d597954d
Merge "Document INI format for Config Reference"
Merge "Ceilometer install: ensure keystone authentication"