[__git] Simplify exporters.

Instead of using stat, we can rely on ls.
Thanks to @ssrq for pointing that out.

cdist/conf/type/__git/explorer/group

@@ -1 +0,0 @@
-owner

cdist/conf/type/__git/explorer/group

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+destination="/$__object_id/.git"
+
+# See: cdist/conf/type/__file/explorer/stat
+ls -ld "$destination" | awk '{ print $4 }'

cdist/conf/type/__git/explorer/owner

@@ -2,28 +2,5 @@
 
 destination="/$__object_id/.git"
 
-action="$(basename "${0}")"
-
-case $action in
-	owner)
-		bsd_fmt="%Su"
-		linux_fmt="%U"
-	;;
-	group)
-		bsd_fmt="%Sg"
-		linux_fmt="%G"
-	;;
-esac
-
-
-os="$(uname | tr '[:upper:]' '[:lower:]')"
-
-case $os in
-	*bsd)
-		# Checked on OpenBSD, FreeBSD and NetBSD
-		stat -f "${bsd_fmt}" "${destination}" 2>/dev/null || exit 0
-	;;
-	*)
-		stat --print "${linux_fmt}" "${destination}" 2>/dev/null || exit 0
-	;;
-esac
+# See: cdist/conf/type/__file/explorer/stat
+ls -ld "$destination" | awk '{ print $3 }'