Add manage_service feature

puppet-glance lacks of disabling service managing. This patch adds
$manage_service parameter to relevant classes.

Change-Id: I222b1a3318f5163f6ad1e39cbb8be10c440ab99f
Closes-bug: #1359823
add command_options to glance::cache::[cleaner|pruner]

The parameter command_options allows to add options
(like config file to use) to the cron job command.
This makes it also possible to redirect the output.

Extend tests, to support different operating systems
and test parameters.

Change-Id: I12a76e742db7279eafa3f3ec3c92947ff551b782
New parameter for swift backend

New parameter is 'swift_store_large_object_size'.

Sometimes default value (5G) doesn't work when user attempts to
make a snapshots with size > 300 Mb. So it may be usefull to have
a possibity to adjust this parameter to your needs.

Change-Id: I08336b91b0cd294a86326605fb6c28653e8eedb8
Merge "add command_options to glance::cache::[cleaner|pruner]"
Merge "Add manage_service feature"
Merge "New parameter for swift backend"