Update switch_all_submodules_to_head_and_clean

+ cleaning of temporary branches combined into one operation along with pull
+ this prevents additional communication with the remote server
+ all remote servers will be fetched and also pruned

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 9bb83bf90c)

switch_all_submodules_to_head_and_clean

@@ -67,12 +67,11 @@ updateModule() {
         git clean -dxff
     fi
     git checkout $branch
-    git pull --rebase $GIT_NO_RECURSE_SUBMODULES
+    git pull --rebase --all --prune $GIT_NO_RECURSE_SUBMODULES
     if [[ ! -z "`git status --porcelain $GIT_IGNORE_SUBMODULES`" ]]; then
         git reset --hard HEAD
         git clean -dxff
     fi
-    git remote prune origin
 
     if [[ -e $PARENTDIR/$MODULE.gitmodules ]]; then
         if [[ $gituser == "anonymous" ]]; then