RELENG-62 Add Bamboo build number to USB builds
RELENG-62 Add Bamboo build number to USB builds

Was on the COAL builds, want it on the USB builds too.

numericillustration/sdc-headnode,kaizengarden/sdc-headnode,joyent/sdc-headnode,joyent/sdc-headnode,numericillustration/sdc-headnode,kaizengarden/sdc-headnode,kaizengarden/sdc-headnode,joyent/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode,numericillustration/sdc-headnode