MFC r321949, r321950, r322101:

MFC r321949, r321950, r322101:

 r321949 (ngie):
  Add expected failures for ZFS

  - :f_flag fails on ZFS because UF_IMMUTABLE isn't supported.
  - :v_flag fails on ZFS because the mode for foo is [always] updated
    unnecessarily.

  get_filesystem(..) (supporting function that was added to the test
  script) is based on equivalent logic in
  usr.bin/extattr/tests/extattr_test.sh .

 r321950 (ngie):
  Always use first parameter passed to get_filesystem(..) instead of
  discarding it and using `.` instead.

 r322101 (ngie):
  Don't check result of chflags in f_flag_cleanup()

  This will prevent false positives from occurring if the test is run
  on ZFS since ZFS doesn't support fflags throbbing like UFS.

PR:		221188, 221189
Approved by:	re (marius)
Sponsored by:	The FreeBSD Foundation

git-svn-id: svn://svn.freebsd.org/base/stable/10@322759 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f