Bug 2192 - Part2 - Move getProperty() to a common util module

With this change, the calls to obtain non-default configurations for OVSDB
have been moved to a single function.

Patch 2: Rename utils.common to utils.config
         Remove utils.config dependency from common/parent/pom.xml (not needed by all)

Change-Id: Ibf7e1ee2747c5cafc59da97b5f1f8a4390d95ca2
Signed-off-by: Flavio Fernandes <ffernand@redhat.com>