MB-8536: tidied redundant tasks in cbcollect_info
MB-8536: tidied redundant tasks in cbcollect_info

Perticularly there's no need to invoke netstat -an[p] twice and no
need to ls membase directories twice. Also as pointed out in the
ticket we grab syslogs separately so there's no need to cat them.

Change-Id: I46968967c4fcfdcd606ed83945f290b37b0d9e8f
Reviewed-on: http://review.couchbase.org/29441
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>

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