Adding features: odl-didm-hp3800 to integration bundle.

Adding features: odl-didm-hp3800 to integration bundle.
Tested and verified that the integration test cases are passed with latest config file changes in didm project for hp-3800-impl

1) Feature Tests Pass:  https://jenkins.opendaylight.org/releng/job/didm-merge-beryllium/33/
2) Features Comply with Guidelines: https://git.opendaylight.org/gerrit/gitweb?p=didm.git;a=blob;f=features/src/main/features/features.xml
        a) Feature Names: Prefixed with 'odl-' : odl-didm-hp3800
        b) Features Descriptions: Present
        c) Features Start-Levels: No start-levels on <bundle> elements or <feature> elements
3) Features Tested: Features have been tested for functionality with
        a) feature:install  odl-didm-hp3800
        b) feature:install  odl-didm-hp3800, odl-integration-compatible-with-all
4) Integration Test Impact - none.

Change-Id: I481e6ababcaa6784af33fcad0245cf2ea2841f93
Signed-off-by: Anandhi Manikantan <anandhi.manikantan@hpe.com>