Feature #2357: Fix disk_type detection.

By default it is FILE, and now disk_type = file also works.
Feature #1678: Simpler algorithm to distribute hosts homegeneously in collectd-client.rb
Remove debug information in TemplateJSON
Bug #2385 & #2418: Fix quota for nic attach when the owner is another user
Bug #2424: Fix nic-detach failure action
Update messages.pot
Add tip for SCHED_DS_REQUIREMENTS
Fix deadlock when deleting a host with running VMs
StopMonitor action for IM dummy drivers
Avoid sending prolog and epilog actions to already deleted (or non existent) hosts
01-dns script processes SEARCH and sets it in /etc/resolv.conf.
Feature #1678: Add a new MONITORING_PUSH_INTERVAL
configuration option that handles the  time between push
monitoring intervals. This new parameter is passed on to the
collectd-client.rb
Updated man pages
Feature #1678: Simplify the collectd-client.rb algorithm by adding
a random sleep at the beginning.
Getting rid of overengineering
feature #1678: Remove host right before sending the STOPMONITOR action to driver
Feature #1678: Don't process MONITOR_PUSH_INTERVAL in the core.
Feature #1678: The monitor push interval is now defined in the args
of the collectd IM_MAD as "-i"
feature #2428: add aws-sdk dependency to install_gems
Add trollop dependency for rbvmomi to install_gems