Updated settings for keeping old builds

Updated settings for keeping old builds

Without this settings Jenkins accumulates all old builds and for some
jobs it's really a lot. This makes Jenkins starting very slow as it
scans builds/ directories for every job on the start.

Change-Id: Ia9ca5c5171e9006a6506d5ecb7f50cdf9d8f17e6
Signed-off-by: Ed Bartosh <eduard.bartosh@intel.com>