task/daemon-helper: Add nostdin option
task/daemon-helper: Add nostdin option

Some daemons (smbd) will try to read from stdin and check if its a
socket, using that for sending/receiving messages.  If /dev/null is
used for stdin, the daemon aborts.  This patch adds a 'nostdin' option
to the daemon-helper so that the daemon can be started without /dev/null
as stdin.

Signed-off-by: Sam Lang <70ab3b98ad075c66e7d3501cb42b80a7e41da316@inktank.com>

zhouyuan/teuthology,ceph/teuthology,robbat2/teuthology,ivotron/teuthology,michaelsevilla/teuthology,dmick/teuthology,dmick/teuthology,tchaikov/teuthology,ivotron/teuthology,dreamhost/teuthology,ktdreyer/teuthology,yghannam/teuthology,caibo2014/teuthology,dreamhost/teuthology,ktdreyer/teuthology,SUSE/teuthology,SUSE/teuthology,zhouyuan/teuthology,yghannam/teuthology,dmick/teuthology,michaelsevilla/teuthology,t-miyamae/teuthology,SUSE/teuthology,tchaikov/teuthology,robbat2/teuthology,ceph/teuthology,caibo2014/teuthology,t-miyamae/teuthology