upgrade oss sai to 1.7.0

Summary:
moving to 1.7.0 for open source github sai

also build fake with 1.7.0

Differential Revision: D26152792

fbshipit-source-id: 02e7bfb218d200666e506e3115ee8f5dba5ece0a

build/fbcode_builder/manifests/libsai

@@ -2,12 +2,12 @@
 name = libsai
 
 [download]
-url = https://github.com/opencomputeproject/SAI/archive/v1.6.3.tar.gz
-sha256 = ff09308fea187885b8f4d86446c5e0c097e801e8fe98de1b5e25cdc80d52e3cb
+url = https://github.com/opencomputeproject/SAI/archive/v1.7.0.tar.gz
+sha256 = ff0a07d27e1e8b762c087b9b430dd1f219a3159e155132e2f2ea39e619d8ad5f
 
 [build]
 builder = nop
-subdir = SAI-1.6.3
+subdir = SAI-1.7.0
 
 [install.files]
 inc = include