Update to using go1.9 as the default go version

Get rid of Makefile spaghetti for avoiding vendor directory where
possible in make check.

.travis.yml

@@ -5,8 +5,9 @@ os:
 - linux
 go:
 - 1.6.4
-- 1.7.4
+- 1.7.6
 - 1.8.3
+- 1.9
 - tip
 install:
 - git fetch --unshallow --tags
@@ -31,12 +32,12 @@ matrix:
   - go: tip
   include:
   - os: osx
-    go: 1.8.3
+    go: 1.9
     env: GOTAGS=""
 deploy:
   provider: script
   script: make travis_beta
   on:
     branch: master
-    go: 1.8.3
+    go: 1.9
     condition: "`uname` == 'Linux'"

Makefile

@@ -4,7 +4,7 @@ LAST_TAG := $(shell git describe --tags --abbrev=0)
 NEW_TAG := $(shell echo $(LAST_TAG) | perl -lpe 's/v//; $$_ += 0.01; $$_ = sprintf("v%.2f", $$_)')
 GO_VERSION := $(shell go version)
 GO_FILES := $(shell go list ./... | grep -v /vendor/ )
-GO_LATEST := $(findstring go1.8,$(GO_VERSION))
+GO_LATEST := $(findstring go1.9,$(GO_VERSION))
 BETA_URL := https://beta.rclone.org/$(TAG)/
 # Pass in GOTAGS=xyz on the make command line to set build tags
 ifdef GOTAGS
@@ -45,7 +45,7 @@ endif
 # Do source code quality checks
 check:	rclone
 ifdef GO_LATEST
-	go tool vet $(BUILDTAGS) -printfuncs Debugf,Infof,Logf,Errorf . 2>&1 | grep -E -v vendor/ ; test $$? -eq 1
+	go vet $(BUILDTAGS) -printfuncs Debugf,Infof,Logf,Errorf ./...
 	errcheck $(BUILDTAGS) $(GO_FILES)
 	find . -name \*.go | grep -v /vendor/ | xargs goimports -d | grep . ; test $$? -eq 1
 	go list ./... | grep -v /vendor/ | xargs -i golint {} | grep -E -v '(StorageUrl|CdnUrl)' ; test $$? -eq 1