Merge pull request #1969 from valyala/go1.6

Switch from go1.5 to go1.6

toolset/setup/linux/languages/go.sh

@@ -5,7 +5,7 @@ RETCODE=$(fw_exists ${IROOT}/go.installed)
   source $IROOT/go.installed
   return 0; }
 
-VERSION=1.5.2
+VERSION=1.6
 GOROOT=$IROOT/go
 
 fw_get -O https://storage.googleapis.com/golang/go$VERSION.linux-amd64.tar.gz
@@ -14,6 +14,6 @@ fw_untar go$VERSION.linux-amd64.tar.gz
 echo "export GOROOT=${IROOT}/go" > $IROOT/go.installed
 echo -e "export GOPATH=\$TROOT" >> $IROOT/go.installed
 echo -e "export PATH=\$GOROOT/bin:\$PATH" >> $IROOT/go.installed
-echo "export GOGC=800" >> $IROOT/go.installed
+echo "export GOGC=1000" >> $IROOT/go.installed
 
 source $IROOT/go.installed