dim: Introduce an option for maintainers to bypass missed link

In some rare situations it is better to bypass this requirement on purpose
then to rebase the whole branch. So, let's add a helper instead of
temporarily editing dim every time we need to do this.

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

dim

@@ -1032,7 +1032,7 @@ function checkpatch_commit_push
 	fi
 
 	# check for Link tag
-	if [[ "$managed_branch" = "1" ]] && ! git show -s $sha1 | grep -qi 'Link:'  ; then
+	if [[ $LINK_MISSING_I_KNOW -ne 1 ]] && [[ "$managed_branch" = "1" ]] && ! git show -s $sha1 | grep -qi 'Link:'  ; then
 		echoerr "$cite: Link tag missing."
 		rv=1
 	fi
@@ -2806,9 +2806,10 @@ DRY_RUN=
 INTERACTIVE=
 DRY=
 FORCE=
+LINK_MISSING_I_KNOW=
 HELP=
 
-while getopts hdfis opt; do
+while getopts hdfils opt; do
 	case "$opt" in
 		d)
 			DRY_RUN=--dry-run
@@ -2824,6 +2825,11 @@ while getopts hdfis opt; do
 		h)
 			HELP=1
 			;;
+		l)
+			if ask_user "This option to ignore missed links should only be used by maintainers on rare situations. Are you sure?"; then
+				LINK_MISSING_I_KNOW=1
+			fi
+			;;
 		s)
 			# FIXME: transitional, do unconditionally at the top
 			# when there are no more errors about unbound variables