Updating Apex to OpenStack Ocata

- power management updated to virtualbmc, pxe_ssh is deprecated
- removing custom tacker build
- removing custom congress build
- disabling yum update in undercloud on the cli instead of in a patch
- Undercloud is direct kernel booted now, there are no kernel and initrd
  in the disk image from upstream
- remove OpenDaylight previous to Carbon

JIRA: APEX-433
JIRA: APEX-432
JIRA: APEX-431

Change-Id: I6963f16e65eacade5607a3082b58b6150331406c
Signed-off-by: Dan Radez <dradez@redhat.com>