introduce get_cmdline() for retreiving the value of a processes
proc/self/cmdline value.
Acked-by: NDavid Rientjes <rientjes@google.com>
Acked-by: NStephen Smalley <sds@tycho.nsa.gov>
Acked-by: NRichard Guy Briggs <rgb@redhat.com>
Signed-off-by: NWilliam Roberts <wroberts@tresys.com>
Signed-off-by: NEric Paris <eparis@redhat.com>