hosting 6.x-2.0-rc5

Hosting is part of the Aegir Hosting System. For the full release notes see: http://community.aegirproject.org/2.0-rc5

Changes since 6.x-2.0-rc4:

• Issue #2085077 by chertzog, ergonlogic, anarcat: Fix invalid argument supplied for foreach() in hosting.ip.inc.
• Include constant definition for install.
• take cluster, pack and queued modules out of experimental
• #2103173: Provide an example of saving data to a site context.
• #1971348 by chertzog, helmo | dman: Fixed Site aliases get chopped if longer than 50 characters.
• #2100251: Trigger verify when hosting features are enabled from Drush.
• #2098389: Record the enabled features in /var/aegir/.drush/drushrc.php.
• Move complicated join to a helper function, so it becomes easier to look up the hostmaster site's nid.
• #2097363 by clemens.tolboom: Fixed Add site spins forever.
• Fix warnings, on create server
• #2077793 by helmo: Fixed Queue daemon collecting quotes.
• #1387578 by chertzog: Fixed hosting_queues_cron_cmd() makes unwarranted assumptions about bash availablility.
• #1882708 by chertzog | Deciphered: Fixed Unused 'release_id()' field in 'hosting_platform()'.
• send to the backend a ip_addresses array instead of a single entry, as we support multiple servers
• #2012508 by chertzog | helmo: Fixed hosting_context_name() returns '@' if node not found.
• #2061509 by chertzog: Fix list of platforms is no longer updated to match install profile clicked at node/add/site.
• #2046783 by helmo | ergonlogic: Add update hook to enable jquery_update