Added Karaf console connection timeout configurability

Added Karaf console connection timeout configurability

The default is 10 seconds which may be too short for some
suites, for example the scaling suite needs a massive timeout
due to the memory leak bugs that cause massive garbage
collection pauses especially when multiple scaling test
suites are invoked in a row. This change adds a keyword
which allows these affected suites to specify a different
timeout that better suits them.

Change-Id: I4532f4d108999aa34a2a8dce3221b4c24e4e08cf
Signed-off-by: Jozef Behran <jbehran@cisco.com>