Reduce warnings in vos.c

Reduce warnings in vos.c

Squash a few miscellaneous that appear when building vos.c:

 -- CreateVolume should use util_GetUInt32 to parse vol ids, since they
    are now unsigned

 -- The m_uuid argument of print_addrs is altered, so do not declare it
    const

 -- Declare the confDir argument of ugen/vsu_ClientInit to be const,
    since it does not change, and vos.c passes a const confDir in
    MyBeforeProc

 -- Ignore implicit function declaration warnings and remove
    CFLAGS_NOERROR from the vos.c build, since the only remaining
    warning is an implicit function declaration

Reviewed-on: http://gerrit.openafs.org/602
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>