Add submodule-timeout for submodule operations

Add submodule-timeout for submodule operations

Some ONAP projects using CLM (SDC) require more submodule
timeout to let the Nexus report run successfully. Allow an
option to provide a submodule-timeout to gerrit-maven-clm
keeping the default to 10 minutes.

Add submodule-timeout parameter for both lf-infra-gerrit-scm
and lf-infra-github-scm.

Main issue and tests described in the asociated Jira.

Issue: RELENG-1297
Change-Id: Ia7d292df9bac53d760767d9ee2caeec2f84c48ac
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>