update path to mergerfs buildtools

roles/mergerfs/tasks/installation.yml

@@ -25,7 +25,7 @@
   shell:
     cmd: >
          git checkout {{ mergerfs_version.stdout }} &&
-         tools/install-build-pkgs &&
+         buildtools/install-build-pkgs &&
          make rpm
     chdir: /root/mergerfs
     creates: "{{ mergerfs_rpm }}"