Add camera validation logic when adding a new camera into middlebox.
Add camera validation logic when adding a new camera into middlebox.

The validation logic make sure, the camera is not configured before in
middlebox and the credentails are valid.

Signed-off-by: sugu <dc89b2f09e5fde6c7ca6b106c22fcc7affc98a48@gmail.com>

sugchand/neoview-middle-box,sugchand/neoview-middle-box,sugchand/neoview-middle-box