Update gems to pull in latest omnibus-sofware to fix Heartbleed

In addition to updating omnibus-software, also updated
  mixlib-shellout to 1.4.0 from 1.3.0
  ohai to 6.22.0 to 6.20.0
remove obsoletes reference.

this is bad copypasta from the chef project.  the chef project
needs to replace "chef-full" which used to be the name of the
artifact that was produced a long time ago and we changed the
name.  the chef-server artifact has always been named that, so it
never needed this line at all.

this fixes errors in yum like:

"Cannot install package chef-server-11.0.12-1.el6.x86_64. It is
obsoleted by installed package chef-server-11.0.10-1.el6.x86_64"

this cannot fix existing broken installations that have obsoletes
so users should probably use this for now (which uses rpm, not
yum to do the install):

curl -L https://www.opscode.com/chef/install.sh | bash -s -- -P server
Merge pull request #55 from opscode/lcg/remove-obsoletes

remove obsoletes reference.
Merge branch 'mm/master-update-CVE-2014-0160'
Update changelog with recently updates to omnibus-software

These ensure the heartbleed openssl fixes make it onto master for the
release
Merge branch 'mm/update-changelog-updated-omnibus-software'
Bump webui to 11.1.1
Add note about depsolver change

11.1 goes from the all erlang depsolver back to gecode
Updage bookshelf to 1.1.3

From 0.2.8
Merge branch 'mm/update-bookshelf'
Add note to changelog about rabbitmq default port change
Add a note about upgrading pre-11.0.8 installs and runit change

In 11.0.8 the name of the Chef server runit was changed from having
opscode in the name to using chef-server. It has been observed that
in some installs this change can leave behind orphaned processes.
This updated includes directions on how to avoid this.

Ideally we would add a prerm script to run these steps, but that hasn't
yet been done.
Merge branch 'mm/notes-on-runit'
Update omnibus-software to pull in the updated chef-client

This will pull in the updated software config that pulls in chef-client
11.12.2 that will then be bundled with the chef-server
Update changelog to reflect updated omnibus-software
Merge branch 'mm/update-omnibus-software'
Note update of chef client in the changelog

Updated embedded chef client from 11.10.4 to 11.12.2
Add build-metadata into packages
Changed build-metadata to version-manifest.json