Fix endpoint create request/response

The endpoint create request and response samples were missing the
wrapping element ("endpoint"), and also the service_id field which
is required.

Change-Id: I9601049f6c9381126938d043c3b8fd510a5f3c74
Fix PATCH endpoint

The docs for PATCH endpoint said that there was no request body.
A request body is required which contains the fields to update.

Also, the response didn't show that the "endpoint" container was
included.

Change-Id: I80516491e2f4534361dcda063168600a3b68298d
Fix POST /v3/tokens response codes

POST /v3/tokens doesn't return 203 as far as I can tell.

Change-Id: I8b8d8f8b8f8254d871874ca2b11bdb6915889794
Fix path to auth token resource

The path for the token resource was /v3/tokens, but the identity
v3 spec says the path is /v3/auth/tokens.

For example, to get a token, you POST /v3/auth/tokens, not
POST /v3/tokens.

Change-Id: I4a7c8f3e23f81bef6ee50d30f834c23775c13561
Fix GET /v3/services response

The GET /v3/services response was missing the containing object
with "services" key, and also missing the links.

Change-Id: If13cac252e1ddbc0b67a215176de48da017e7e22
Add domain_id to /v3 group responses

The example responses for the identity /v3 group responses
(create, get, and update group) didn't include the domain_id like
the real response does.

Change-Id: I8f8c20f0862a326e1496e037ef545acf31042d3f
Fix GET v3/services/{service_id} response

The example response for the GET v3/services/{service_id} was
missing the wrapper object.

Change-Id: I460810fa78227b14e0aac935a67c3761e05c5e55
Merge "Fix PATCH endpoint"
Merge "Fix endpoint create request/response"
Merge "Fix GET /v3/services response"
Merge "Fix GET v3/services/{service_id} response"
Merge "Fix path to auth token resource"
Merge "Fix POST /v3/tokens response codes"
Merge "Add domain_id to /v3 group responses"