Makefile: use git describe --always
Makefile: use git describe --always

always does the same thing but internally to git without throwing an
error, sweet.

cp16net/virgo-base,cp16net/virgo-base,kaustavha/rackspace-monitoring-agent,AlphaStaxLLC/rackspace-monitoring-agent,virgo-agent-toolkit/rackspace-monitoring-agent,christopherjwang/rackspace-monitoring-agent,cp16net/virgo-base,christopherjwang/rackspace-monitoring-agent,kaustavha/rackspace-monitoring-agent,virgo-agent-toolkit/rackspace-monitoring-agent,cp16net/virgo-base,AlphaStaxLLC/rackspace-monitoring-agent,cp16net/virgo-base