AAI-1492 Add ext-aai-network schema for CCVPN uc
Issue-ID: AAI-1492
Add ext-aai-network element to network namespace.
Add components from network namespace.
Add esr-system-info component.
Add EdgeRules from ext-aai-network to esr-system-info, connectivity and
all the other schema elements.
Make esr-system-info dependentOn ext-aai-network.
Change sub-components of ext-aai-network to COUSIN edge as workaround.
Add relationship-list as workaround.
Change-Id: I8ec11660db7887c5aebcdbe2899c95c457f74e14
Signed-off-by: Keong Lim <keong.lim@huawei.com>