__ipset: do not make use of grep -P flag as it is marked as experimental

cdist/conf/type/__ipset/explorer/content

@@ -19,7 +19,7 @@
 #
 
 name="$__object_id"
-if ipset -t list | grep -qP "Name: $name"; then
+if ipset -t list | grep -qFx "Name: $name"; then
     ipset list "$name" | sed '0,/^Members:/d'
 else
     echo "x_missing_x"

cdist/conf/type/__ipset/explorer/type

@@ -19,8 +19,8 @@
 #
 
 name="$__object_id"
-if ipset -t list | grep -qP "Name: $name"; then
-    ipset -t list "$name" | grep -P "^Type: " | awk '{print $2}'
+if ipset -t list | grep -qFx "Name: $name"; then
+    ipset -t list "$name" | grep "^Type: " | awk '{print $2}'
 else
     echo "x_missing_x"
 fi

cdist/conf/type/__ipset/files/ipsets-save

@@ -22,7 +22,7 @@ mkdir -p /etc/ipset.d/
 if [ -n "$1" ]; then
     ipset save "$1" > "/etc/ipset.d/${1}.saved"
 else
-ipset -t list | grep -P "^Name:" | awk '{print $2}' | while read s; do
+ipset -t list | grep "^Name:" | awk '{print $2}' | while read s; do
     ipset save $s > /etc/ipset.d/$s.saved
 done
 fi

cdist/conf/type/__ipset/gencode-remote

@@ -54,7 +54,7 @@ esac
 if [ "$state_should" = "present" ]; then
     if [ -f "$p/add" ]; then
         while read -r value; do
-            if ! grep -q "$value" "$e/content"; then
+            if ! grep -qFx "$value" "$e/content"; then
                 echo "ipset -! add $name $value"
                 needToSave=1
             fi
@@ -63,7 +63,7 @@ if [ "$state_should" = "present" ]; then
 
     if [ -f "$p/del" ]; then
         while read -r value; do
-            if grep -q "$value" "$e/content"; then
+            if grep -qFx "$value" "$e/content"; then
                 echo "ipset -! del $name $value"
                 needToSave=1
             fi