packaging: open source like versioning scheme

Add version.mak with version information.

Major and minor components are taken from pom.xml.
Fix is taken from version.mak.

Milestone is a string representation of the milestone
example for ordering:
 - master
 - alpha
 - master
 - beta
 - master
 - beta2
 - master
 - rc
 - master
 - rc2
 - master
 - <none>

RPM_RELEASE is a rpm specific release string that should be manually
modified after milestone change.

Example of sequence:

 # master
 FIX_RELEASE=0
 MILESTONE=master
 RPM_RELEASE=0.0.$(MILESTONE).$(shell date -u +%Y%m%d%H%M%S)

 # beta
 FIX_RELEASE=0
 MILESTONE=beta
 RPM_RELEASE=0.1

 # post beta
 FIX_RELEASE=0
 MILESTONE=master
 RPM_RELEASE=0.2.$(MILESTONE).$(shell date -u +%Y%m%d%H%M%S)

 # release
 FIX_RELEASE=0
 MILESTONE=
 RPM_RELEASE=1

 # post release
 FIX_RELEASE=1
 MILESTONE=master
 RPM_RELEASE=0.0.$(MILESTONE).$(shell date -u +%Y%m%d%H%M%S)

Change-Id: Ibe7d85addc16950a3efbebb1f6e157d5401745b2
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>