CBQE-1090: add scripts/measure_sched_delays.py

Syntax: measure_sched_delays.py [options]

Options
 -i <file>        Path to .ini file containing cluster information.
 -p <key=val,...> Comma-separated key=value info.

Available keys:
 path=<file_path> The destination path to folder for deploying and running measure-sched-delays.tar.gz script
 task=<start/stop/fetch_logs> sart/stop measure-sched-delays script or fetch its logs ('start' by default)

Example:
 measure_sched_delays.py -i cluster.ini -p path=/tmp/measure-sched-delays,task=start

Change-Id: I1921feb2cd77516f098f2373d72c813a3a63ffbc
Reviewed-on: http://review.couchbase.org/25121
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Deepkaran Salooja <deepkaran.salooja@globallogic.com>