mgcp_client_test: use "\r\n\r\n" instead of "\n\n"

The separator between MGCP and SDP section is typically "\r\n\r\n". For some
reason the test so far used "\n\n" instead, rather use the standard separator.

Change-Id: I41c73722e5fae00663bcf96de0b57b7155809a06
diff --git a/tests/mgcp_client/mgcp_client_test.ok b/tests/mgcp_client/mgcp_client_test.ok
index 58c4b82..4b1e78c 100644
--- a/tests/mgcp_client/mgcp_client_test.ok
+++ b/tests/mgcp_client/mgcp_client_test.ok
@@ -11,8 +11,8 @@
 composed response:
 -----
 200 1 OK

-I: 1
-
+I: 1

+

 v=0

 o=- 1 23 IN IP4 10.9.1.120

 s=-

@@ -141,8 +141,8 @@
 composed response:
 -----
 200 1 OK

-I: 1
-
+I: 1

+

 v=0

 
 -----