RPM: Apex: Refactor build scripts:

Remove reference to undercloud.
Fix dependencies list.
Refactor build ovs and build dpdk and test scripts.
Correct default dpdk version in build ovs script.
Remove references to instack VM -- no longer necessary.
Remove script using custom Apex-lite-liberty for testing
Consolidated functions and cleanup in response to reviewers.

Change-Id: I0875acd87580769c7cd7e87b97bb3e04f0159b32
Signed-off-by: Thomas F Herbert <therbert@redhat.com>