LU-14034 hsm: add PID file handling to lhsmtool_posix

LU-14034 hsm: add PID file handling to lhsmtool_posix

Add pid-file handling to lhsmtool_posix to prevent accidentally
running concurrent instances of the copytool. (Multiple instances are
still allowed if you do not use PID files or use separate files.)

Use the PID file to avoid needing libtool when stopping, continuing,
or killing the copytool from test scripts.

Remove unnecessary libtool usage from test scripts.

Signed-off-by: John L. Hammond <jhammond@whamcloud.com>
Change-Id: I4f012a88c58f3a86a731df3b7d35ff32db047c2d
Reviewed-on: https://review.whamcloud.com/40253
Tested-by: Maloo <maloo@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Ben Evans <beevans@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>