LU-8235 scripts: pass unrecognized options to lfs migrate

LU-8235 scripts: pass unrecognized options to lfs migrate

Pass through any unrecognized options to the "lfs migrate" command,
allowing the script to support migrate options without any special
handling.

Add new options "--rsync" and "--no-rsync" to specify how rsync
is used as a fallback alternative for the "lfs migrate" command.
The "--rsync" option forces the use of rsync instead of lfs migrate,
while the "--no-rsync" option prevents falling back to rsync in
the case where lfs migrate fails.

Add new "--dry-run" option.  The current "-n" option for a dry-run
duplicates the "-n" option to designate non-block for "lfs migrate".
The script's usage of "-n" is therefore deprecated, so that a future
patch can instead pass it through.

Add new "-v" option to increase verbosity, to help test/debug/monitor
what is being done by the script.  This option is also passed
through to "lfs migrate".

Test-Parameters: trivial
Signed-off-by: Nathan Dauchy <Nathan.Dauchy@noaa.gov>
Signed-off-by: Steve Guminski <stephenx.guminski@intel.com>
Change-Id: Ia3f56bf528d2ac8155f08d93d01abd8bb9168cc4
Reviewed-on: https://review.whamcloud.com/20621
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>