__acl: replace sed -r where possible or make it portable without -r

cdist/conf/type/__acl/explorer/acl_is

@@ -27,6 +27,5 @@ then
 fi
 
 getfacl "/$__object_id" 2>/dev/null \
-    | grep -E '^(default:)?(user|group|(mask|other):):[^:]' \
+    | grep -Eo '^(default:)?(user|group|(mask|other):):[^:][[:graph:]]+' \
-    | sed -r 's/\s*#.+$//' \
     || true

cdist/conf/type/__acl/gencode-remote

@@ -37,7 +37,7 @@ do
 
     while read -r acl
     do
-        if echo "$acl" | sed -r 's/(.*)://' | grep -Fq 'X'
+        if echo "$acl" | awk -F: '{ print $NF }' | grep -Fq 'X'
         then
             if [ "$is_dir" = '1' ]
             then
@@ -46,7 +46,7 @@ do
                 rep=-
             fi
 
-            acl="$( echo "$acl" | sed -r "s/(.*)X/\1$rep/" )"
+            acl="$( echo "$acl" | sed "s/\(.*\)X/\1$rep/" )"
         fi
 
         if echo "$parameter" | grep -Eq '(mask|other)'
@@ -98,7 +98,7 @@ then
             then continue
             fi
 
-            no_bits="$( echo "$acl" | sed -r 's/:[rwx-]+$//' )"
+            no_bits="$( echo "$acl" | sed 's/:...$//' )"
 
             echo "$setfacl_exec -x \"$no_bits\" \"$acl_path\""
         done