Plugin load fails when using libblockdev API

Issue

• Plugin load fails when using libblockdev API:

[root@host]# ./sample_script.py 

** (process:31170): WARNING **: 17:53:59.004: The 'ntfscluster' utility is not available
The 'ntfslabel' utility is not available
The 'ntfsresize' utility is not available
The 'ntfsfix' utility is not available
The 'mkntfs' utility is not available
Traceback (most recent call last):
  File "./sample_script.py", line 18, in <module>
    succ_ = bd.init(requested_plugins)
  File "/usr/lib64/python3.6/site-packages/gi/overrides/BlockDev.py", line 91, in init
    return _init(require_plugins, log_func)
GLib.Error: g-bd-init-error-quark: Failed to load plugins (0)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./sample_script.py", line 20, in <module>
    raise RuntimeError("Failed to initialize libbd and its plugins (%s)" % REQUESTED_PLUGIN_NAMES)
RuntimeError: Failed to initialize libbd and its plugins ({'fs'})