CBQE-791: Initialize nodes/buckets - systests

- Correction in accepting parameters for
the number of sasl_buckets, etc.
	- Convert number to string for testrunner to
	read them as expected

Change-Id: I2e9a09cf878b614706e6238fcbefe64c2d94404c
Reviewed-on: http://review.couchbase.org/24673
Reviewed-by: abhinav dangeti <abhinav.dangeti@gmail.com>
Tested-by: abhinav dangeti <abhinav.dangeti@gmail.com>