volserver: Exit on arg parsing failure

If ParseArgs returns an error, argument parsing failed. Currently we
keep going anyway, ignoring the error. Exit instead.

Change-Id: I2f9e4e06d6c3fab8e29921bdb0ea30d714c794b1
Reviewed-on: http://gerrit.openafs.org/10422
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
volserver: Restore -allow-dotted-principals

Commit cd3492d0 converted volserver command-line parsing to use
libcmd. However, it accidentally also changed the
-allow-dotted-principals option to -dotted. Change it back to
-allow-dotted-principals for consistency with previous versions, as
well as other server processes.

Note that currently there are no public releases of OpenAFS containing
cd3492d0, so no public release has contained the -dotted option.

Change-Id: Ied07f0eb867a13591656daae00bc9e85a2c7f6c8
Reviewed-on: http://gerrit.openafs.org/10423
Reviewed-by: Marc Dionne <marc.c.dionne@gmail.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
volserver: Remove -sleep functionality

This option is completely useless since the LWP volserver was removed.
Remove the code for it.

Change-Id: I2257ba2ecd2ffeb9c47d21cbb516d6a0abb19b94
Reviewed-on: http://gerrit.openafs.org/10424
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>