Update seastar submodule

* seastar d59fcef...b924495 (2):
  > build: Fix protobuf generation rules
  > Merge "Restructure files" from Jesse

Includes fixup patch from Jesse:

"
Update Seastar `#include`s to reflect restructure

All Seastar header files are now prefixed with "seastar" and the
configure script reflects the new locations of files.

Signed-off-by: Jesse Haber-Kucharsky <jhaberku@scylladb.com>
Message-Id: <5d22d964a7735696fb6bb7606ed88f35dde31413.1542731639.git.jhaberku@scylladb.com>
"

locator/ec2_snitch.hh

@@ -21,7 +21,7 @@
 #pragma once
 
 #include "locator/production_snitch_base.hh"
-#include "http/http_response_parser.hh"
+#include <seastar/http/response_parser.hh>
 
 namespace locator {
 class ec2_snitch : public production_snitch_base {

locator/gce_snitch.hh

@@ -40,7 +40,7 @@
 #pragma once
 
 #include "locator/production_snitch_base.hh"
-#include "http/http_response_parser.hh"
+#include <seastar/http/response_parser.hh>
 
 namespace locator {
 

locator/gossiping_property_file_snitch.hh

@@ -46,7 +46,7 @@
 #include "production_snitch_base.hh"
 #include "exceptions/exceptions.hh"
 #include "service/storage_service.hh"
-#include "core/file.hh"
+#include <seastar/core/file.hh>
 #include "log.hh"
 #include "locator/reconnectable_snitch_helper.hh"
 

locator/production_snitch_base.hh

@@ -46,7 +46,7 @@
 
 #include "gms/endpoint_state.hh"
 #include "locator/token_metadata.hh"
-#include "core/sstring.hh"
+#include <seastar/core/sstring.hh>
 #include "snitch_base.hh"
 
 namespace locator {

locator/rack_inferring_snitch.hh

@@ -38,7 +38,7 @@
 
 #pragma once
 
-#include "core/sstring.hh"
+#include <seastar/core/sstring.hh>
 #include "gms/inet_address.hh"
 #include "snitch_base.hh"
 #include "utils/fb_utilities.hh"

locator/snitch_base.hh

@@ -42,9 +42,9 @@
 #include <vector>
 
 #include "gms/inet_address.hh"
-#include "core/shared_ptr.hh"
-#include "core/thread.hh"
-#include "core/distributed.hh"
+#include <seastar/core/shared_ptr.hh>
+#include <seastar/core/thread.hh>
+#include <seastar/core/distributed.hh>
 #include "utils/class_registrator.hh"
 #include "log.hh"