Use absolute path /usr/bin/dracut in mkdumprd

Since we call dracut directly on current working directory "." so it is
possible to trick root to call fake code.

Thus move to use absolute path instead.

Signed-off-by: Dave Young <dyoung@redhat.com>
Acked-by: Bhupesh Sharma <bhsharma@redhat.com>

mkdumprd

@@ -17,6 +17,7 @@ SAVE_PATH=$(grep ^path $conf_file| cut -d' '  -f2)
 [ -z "$SAVE_PATH" ] && SAVE_PATH=$DEFAULT_PATH
 # strip the duplicated "/"
 SAVE_PATH=$(echo $SAVE_PATH | tr -s /)
+DRACUT_PATH=/usr/bin
 
 is_wdt_addition_needed() {
 	local active
@@ -457,7 +458,7 @@ if ! is_fadump_capable; then
     add_dracut_arg "--no-hostonly-default-device"
 fi
 
-dracut "${dracut_args[@]}" "$@"
+${DRACUT_PATH}/dracut "${dracut_args[@]}" "$@"
 _rc=$?
 sync
 exit $_rc