Adjust API level on swagger and set API doc expansion by default

1. Combine ocloud namespace to one as o2ims inventory v1 level
2. The base url is defined as O2 interface application
3. Each namespace split by the version of service, like IMS inventory v1 is a namespace
4. Set API doc expansion by default

Signed-off-by: Zhang Rong(Jon) <rong.zhang@windriver.com>
Change-Id: I659b966fdc1e3f7fef33ac8b67515ab0c328ebae