Update go to 1.8.2

Since we cache the cipd files in isolate to save a lot of speed on RPIs,
it is no longer necessary to stop compressing our cipd packages.
It only saved us a few seconds on extracting anyway, which is now likely
lost because of the extra download times.
(https://skia-review.googlesource.com/c/16490)

Bug: skia:
NOTRY=true
Change-Id: Ib9b1a29088cddc8790a685935995b0fce07d864f
Reviewed-on: https://skia-review.googlesource.com/17799
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>

infra/bots/assets/asset_utils.py

@@ -122,7 +122,7 @@ class CIPDStore(object):
         '--in', target_dir,
         '--tag', TAG_PROJECT_SKIA,
         '--tag', TAG_VERSION_TMPL % version,
-        '--compression-level', '0',
+        '--compression-level', '1',
     ])
 
   def download(self, name, version, target_dir):

infra/bots/assets/go/VERSION

@@ -1 +1 @@
-1
+2

infra/bots/assets/go/create.py

@@ -12,7 +12,7 @@
 import argparse
 import subprocess
 
-GO_URL = "https://storage.googleapis.com/golang/go1.7.5.linux-amd64.tar.gz"
+GO_URL = "https://storage.googleapis.com/golang/go1.8.2.linux-amd64.tar.gz"
 
 def create_asset(target_dir):
   """Create the asset."""

infra/bots/tasks.json

@@ -4359,7 +4359,7 @@
         {
           "name": "skia/bots/go",
           "path": "go",
-          "version": "version:1"
+          "version": "version:2"
         }
       ],
       "dimensions": [
@@ -4414,7 +4414,7 @@
         {
           "name": "skia/bots/go",
           "path": "go",
-          "version": "version:1"
+          "version": "version:2"
         }
       ],
       "dependencies": [
@@ -4464,7 +4464,7 @@
         {
           "name": "skia/bots/go",
           "path": "go",
-          "version": "version:1"
+          "version": "version:2"
         }
       ],
       "dimensions": [
@@ -4545,7 +4545,7 @@
         {
           "name": "skia/bots/go",
           "path": "go",
-          "version": "version:1"
+          "version": "version:2"
         }
       ],
       "dimensions": [