Added is_running method.

Added is_running method.

Added methods to support the setting and getting of a number of
vserver related rlimits: CPU, RSS, NRPC, NOFILE, MEMLOCK, AS, LOCKS,
SIGPENDING, MSGQUEUE, NSOCK, OPENFD, ANON, SHMEM.

Added methods to support the setting and getting of the above rlimit
values to the vserver's config file.

Added method to set the vserver's WHITELISTED variable in its config
file.  This value is checked by vsh.

Deleted {s,g}et_memlimit {s,g}et_tasklimit.