packaging: add version information

add /etc/default/version.$(PACKAGE) as:

PACKAGE=@PACKAGE_NAME@
VERSION=@PACKAGE_RPM_VERSION@
RELEASE=@PACKAGE_RPM_RELEASE@

to enable software to detect plugin version while running on node.

Change-Id: I3743ef37e804137e2a3517180a67c5fb1a6cecbc
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>