TT#68300 NGCP::API::Client: Use URI->path_query instead of URI->path()

The former will properly parse query strings separated by «?», the
latter will escape the «?» which will break the query arguments.

Change-Id: I29f4916a54f3d49bd5d8b7a2d0a998d57977e1dd

lib/NGCP/API/Client.pm

@@ -99,7 +99,7 @@ sub _get_url {
     my ($self, $uri) = @_;
 
     my $url = $self->{_urlbase}->clone();
-    $url->path($uri);
+    $url->path_query($uri);
 
     return $url;
 }