Add updated submodule references for master
 attempt to resolve bc/crowbar submod conflict
Merge remote-tracking branch 'origin/master'
Merge pull request #1074 from aabes/pull-req-master-06fbb4d59f

update openstack DG [3/6]
Lock redhat-release and centos-release in the build chroot.
Add a README for booting via UEFI.
Add updated submodule references for feature/uefi-netboot/master
Add updated submodule references for master
Merge pull request #1098 from aabes/pull-req-master-70623b5483

pull in nagios for hw monitoring [2/5]
Merge pull request #1094 from VictorLowther/pull-req-feature-uefi-netboot-master-2f46bd5406

Add basic semi-functional support for UEFI netbooting [3/6]
Add updated Nagios subreference.
Add super experimental support for making a CentOS chroot without an ISO.
Update README.online-install to get rid of references to ISOs, since
we no longer need to download them for online mode.
Add updated submodule references for feature/more-online-mode/master
Merge pull request #1117 from VictorLowther/pull-req-feature-more-online-mode-master-af6708cc7b

Remove the requirement to have ISO images in provisioner online mode [3/6]
Add efibootmgr to Sledgehammer
Find the MAC address we booted from if in UEFI mode.
Set the default OS for the provisioner at install time
Make sure we install efibootmgr on the admin node before Crwbar bootstraps itself.
Add updated README for UEFI support.