Bug 1058: Eliminate query parameters from the Location header.

Some REST APIs of the VTN Manager copy the request URI into the Location
response-header. But query parameters in the request URI should not be
copied.

Change-Id: I0ed50c9e4089f896295443b1a73dde87ffdf0321
Signed-off-by: Shigeru Yasuda <s-yasuda@da.jp.nec.com>