Configure NSH_SFC JDK

Configure NSH_SFC JDK

Jenkins 2 moved the JDK configuration to a new Jenkins global
configuration page under Manage Jenkins - Global Tool Configuration.
This patch configures NSH_SFC jobs to run using a specified JDK as
configuration via the Jenkins Global Configuration.  Valid values are:

- openjdk7-centos7
- openjdk8-centos8
- openjdk7-ubuntu1404
- openjdk8-ubuntu1404
- openjdk7-ubuntu1604
- openjdk8-ubuntu1604

This patch configures the following templates to run using JDK8:
- 'nsh_sfc-verify-{stream}-{os}'
- 'nsh_sfc-merge-{stream}-{os}'
- 'nsh_sfc-integration-{stream}-{os}'
- 'nsh_sfc-verify-docs-{stream}'
- 'nsh_sfc-merge-docs-{stream}'

The verify docs don't use the {os} parameter so the OS is hardcoded like
the node names.

Change-Id: I6475877e2a8b8241add7416d0c4fe15b71706429
Signed-off-by: Vanessa Rene Valderrama <vvalderrama@linuxfoundation.org>