Update Vagrantfile to use Go 1.7

Vagrantfile

@@ -5,7 +5,7 @@
 VAGRANTFILE_API_VERSION = "2"
 
 $script = <<SCRIPT
-GOVERSION="1.6"
+GOVERSION="1.7"
 SRCROOT="/opt/go"
 SRCPATH="/opt/gopath"
 
@@ -37,9 +37,13 @@ export GOPATH="$SRCPATH"
 export GOROOT="$SRCROOT"
 export PATH="$SRCROOT/bin:$SRCPATH/bin:\$PATH"
 EOF
+cat <<EOF >>~/.bashrc
+
+## After login, change to terraform directory
+cd /opt/gopath/src/github.com/hashicorp/terraform
+EOF
 sudo mv /tmp/gopath.sh /etc/profile.d/gopath.sh
 sudo chmod 0755 /etc/profile.d/gopath.sh
-source /etc/profile.d/gopath.sh
 SCRIPT
 
 Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|