Update "common" subtree from correct branch

We do not use "master" anymore, hence try to autodetect the proper
branch and fallback to master otherwise.

Signed-off-by: Denis Pynkin <denis.pynkin@collabora.com>

common-subtree.sh

@@ -7,12 +7,15 @@ usage () {
 	echo "'$0 pull' is used to update the common subtree in tests"
 }
 
+branch="$(git symbolic-ref --short HEAD)"
+test -z "$branch" && branch="master"
+
 case $1 in
 pull)
-git subtree pull -P common git@gitlab.apertis.org:tests/common.git master
+git subtree pull -P common git@gitlab.apertis.org:tests/common.git "$branch"
 ;;
 add)
-git subtree add -P common git@gitlab.apertis.org:tests/common.git master
+git subtree add -P common git@gitlab.apertis.org:tests/common.git "$branch"
 ;;
 *) usage;;
 esac