cleanup, remove -race flag when testing (requires CGO)

docker/Dockerfile.xgo

@@ -1,7 +0,0 @@
-FROM techknowlogick/xgo:go-1.17.x
-
-WORKDIR /go/src/github.com/analogj/scrutiny
-
-COPY . /go/src/github.com/analogj/scrutiny
-
-RUN make all

docker/Vagrantfile

@@ -1,18 +0,0 @@
-# This vagrant file is only used for local development & testing.
-
-Vagrant.configure("2") do |config|
-  config.vm.guest = :freebsd
-  config.vm.synced_folder ".", "/vagrant", id: "vagrant-root", disabled: true
-  config.vm.box = "freebsd/FreeBSD-11.0-CURRENT"
-  config.ssh.shell = "sh"
-  config.vm.base_mac = "080027D14C66"
-
-  config.vm.provider :virtualbox do |vb|
-    vb.customize ["modifyvm", :id, "--memory", "1024"]
-    vb.customize ["modifyvm", :id, "--cpus", "1"]
-    vb.customize ["modifyvm", :id, "--hwvirtex", "on"]
-    vb.customize ["modifyvm", :id, "--audio", "none"]
-    vb.customize ["modifyvm", :id, "--nictype1", "virtio"]
-    vb.customize ["modifyvm", :id, "--nictype2", "virtio"]
-  end
-end