Query parameters should be eliminated from the Location header.

Some REST APIs of the VTN Manager copy the request URI into the Location
response-header. If the request URI has query parameters, they are also copied
into the Location header.

For example, if a REST client sends a request to create a VTN with query parameters:

http://127.0.0.1:8080/controller/nb/v2/vtn/default/vtns/vtn_1?param1=10&param2=20

then the VTN Manager returns the request URI, including query parameters,
in the Location header.

HTTP/1.1 201 Created
Location: http://127.0.0.1:8080/controller/nb/v2/vtn/default/vtns/vtn_1?param1=10&param2=20

The absolute URI in the Location header represents the location of a newly
created resource. So query parameters sent by a client should be eliminated
from the Location header like this:

HTTP/1.1 201 Created
Location: http://127.0.0.1:8080/controller/nb/v2/vtn/default/vtns/vtn_1