ci: Set up docker to use Go vagrant too

test/vagrant-spec/scripts/ubuntu-run.docker.sh

@@ -1,7 +1,14 @@
 #!/bin/bash
-set -x
 
 export VAGRANT_SPEC_DOCKER_IMAGE="${VAGRANT_SPEC_DOCKER_IMAGE}"
+
+# Explicitly use Go binary
+export VAGRANT_PATH=/vagrant/vagrant
+
+# Explicitly set high open file limits... vagrant-ruby tends to run into the
+# default 1024 limit during some operations.
+ulimit -n 65535
+
 vagrant-spec ${VAGRANT_SPEC_ARGS} --config /vagrant/test/vagrant-spec/configs/vagrant-spec.config.docker.rb
 result=$?
 

test/vagrant-spec/scripts/ubuntu-run.virtualbox.sh

@@ -1,5 +1,4 @@
 #!/bin/bash
-set -x
 
 export VAGRANT_EXPERIMENTAL="${VAGRANT_EXPERIMENTAL:-1}"
 export VAGRANT_SPEC_BOX="${VAGRANT_SPEC_BOX}"

test/vagrant-spec/scripts/ubuntu-setup.docker.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
-set -xe
+set -e
 
-apt-get update
+apt-get update -q
 apt-get install -qq -y --force-yes curl apt-transport-https
 apt-get purge -qq -y lxc-docker* || true
 curl -sSL https://get.docker.com/ | sh