This commit introduces the enroll command for subclouds.
Test Plan
PASS: Deploy a system controller and run subcloud add
enroll command with migrate command. Verify that an
error is thrown informing that enroll and migrate
cannot run together.
PASS: Deploy a system controller and run subcloud add
enroll command. Verify that the dcmanager API returns
a success.
Change-Id: Icbebdafa746b87cd8b906a9394f161991da9a123
Signed-off-by: Gustavo Pereira <gustavo.lyrapereira@windriver.com>