Removed controller.version variable

- controller.version doesn't make much sense given the BOM is composed
of different modules and the version of the pom.xml at root decide the
version of the whole while each component keeps his versioning.

Change-Id: I9cf6a0e8334cf2725f8e487148fe29cacdbec512
Signed-off-by: Giovanni Meo <gmeo@cisco.com>
Merge " Removed controller.version variable"