* Implements G1 GC optionally. The variable `elastic_g1gc_enabled` has
been added with a default of false. If this option is set true and the
system has more than 4GiB of RAM G1GC will be enabled.
* Adds new thread options
* Better constraints coordination nodes
* Interface recover speed has been limited
* Buffer size is now set correctly
* Serialize elk deployment so that upgrades are non-impacting
Change-Id: I89224eeaf4ed29c3bb1d7f8010b69503dbc74e11
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>