Incorrect computation of release candidate tag

[dennis-behm]

The awk command to compute the next release candidate is failing for release candidates >10:

echo "rel-1.1.0_rc10" | sed 's/^["refs\/tags\/rel-]*//g' | awk -F "rc" '{print "rel-"$1"rc"(-f2 $2+1)}'
--> rel-1.1.0_rc011