Set up Apache on build server for HA

In HA scenarios the build server needs apache::default_vhost enabled but
the other Apache nodes in HA do not.

Change-Id: If891c6895ee53f7f24de8c1b0c3f0bae3c53c5da
Closes-Bug: #1324593
(cherry picked from commit 585834da2353b2649b190d40fad42137063cd03a)
Data mappings for preseed package selection

Add data mappings and variables for selecting additional packages to be
installed by the Cobbler preseed.

Change-Id: If7341b00d4ebb9aef82eb003ecc8bf342f6c2d5d
Closes-Bug: #1317195
Merge pull request #88 from CiscoSystems/pick1324593

Set up Apache on build server for HA
Merge pull request #91 from CiscoSystems/bugs/1317195

Data mappings for preseed package selection
Merge remote-tracking branch 'cisco/icehouse' into bugs/1325080

Conflicts:
	data/data_mappings/common.yaml

Change-Id: I249ab78206f58a445da11d25aa9213b3e891e4d8