grubby-bls: make info print the root parameter if is present in cmdline

The old grubby tool printed the root parameter separated from the other
kernel command line arguments. Make the wrapper have the same behaviour.

Resolves: rhbz#1649791

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>

grubby-bls

@@ -223,9 +223,27 @@ display_info_values() {
     fi
 
     for i in ${indexes[*]}; do
+        local root=""
+        local args=${bls_options[$i]}
+        local opts=(${args})
+
+        for opt in ${opts[*]}; do
+            if echo $opt | grep -q "^root="; then
+                root="$(echo $opt | sed -e 's/root=//')"
+                value="$(echo ${opt} | sed -e 's/\//\\\//g')"
+                args="$(echo ${args} | sed -e "s/${value}[ \t]*//")"
+                break
+            fi
+        done
+
         echo "index=$i"
         echo "kernel=\"${prefix}${bls_linux[$i]}\""
-        echo "args=\"${bls_options[$i]}\""
+        echo "args=\"${args}\""
+
+        if [[ -n $root ]]; then
+            echo "root=\"${root}\""
+        fi
+
         echo "initrd=\"${prefix}${bls_initrd[$i]}\""
         echo "title=\"${bls_title[$i]}\""
         echo "id=\"${bls_id[$i]}\""