MB-8974 suppress unnecessary error messages in cbreset_password
MB-8974 suppress unnecessary error messages in cbreset_password

- do not display failed attempts to read initargs if one of the
  attempts succeeded
- suppress confusing stderr output from erl shell script on mac

Change-Id: Ibe75411caddb21e209734345ee246a9a85764541
Reviewed-on: http://review.couchbase.org/28606
Tested-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>
Reviewed-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>

ceejatec/ns_server,mschoch/ns_server,ceejatec/ns_server,daverigby/ns_server,vzasade/ns_server,nimishzynga/ns_server,daverigby/ns_server,membase/ns_server,ceejatec/ns_server,mschoch/ns_server,t3rm1n4l/ns_server,mschoch/ns_server,vzasade/ns_server,vzasade/ns_server,membase/ns_server,mschoch/ns_server,t3rm1n4l/ns_server,daverigby/ns_server,t3rm1n4l/ns_server,membase/ns_server,ceejatec/ns_server,ceejatec/ns_server,t3rm1n4l/ns_server,nimishzynga/ns_server,nimishzynga/ns_server,mschoch/ns_server,nimishzynga/ns_server,vzasade/ns_server,t3rm1n4l/ns_server,mschoch/ns_server,daverigby/ns_server,membase/ns_server,membase/ns_server,daverigby/ns_server,ceejatec/ns_server,nimishzynga/ns_server,membase/ns_server,nimishzynga/ns_server