Move install operations to partitions field in major version 2.

install_operations and kernel_install_operations will be empty in major
version 2, they are now present in partitions field.

partition_info are still in old location, more refactoring are needed before
moving them.

This patch also moves the kLegancyPartitionName constants from install_plan.h
to payload_constants.h.

TEST=cros_generate_update_payload generate same payload version 1 as before.
Call delta_generator manually with --major_version=2, then cros payload show.
cros_workon_make update_engine --test

Bug: 23694580
Change-Id: If9e9531656480b1174e13b39af7ecb6a81060aac
diff --git a/filesystem_verifier_action.cc b/filesystem_verifier_action.cc
index df54f80..d28526f 100644
--- a/filesystem_verifier_action.cc
+++ b/filesystem_verifier_action.cc
@@ -29,6 +29,7 @@
 #include <chromeos/streams/file_stream.h>
 
 #include "update_engine/boot_control_interface.h"
+#include "update_engine/payload_constants.h"
 #include "update_engine/system_state.h"
 #include "update_engine/utils.h"