add Vagrantfile for Validation Framework dev work

Added a development environment shortcut by way of Vagrantfiles for
CentOS and Ubuntu; also updated README.rst to indicate usage.

Change-Id: I561ecd6cede3c5cdb7605e368d2b031b05612133

README.rst

@@ -1,3 +1,10 @@
 # validations-libs
 
 A collection of python libraries for the Validation Framework
+
+## Development Environment Setup
+
+Vagrantfiles for CentOS and Ubuntu have been provided for convenience; simply
+copy one into your desired location and rename to `Vagrantfile`, then run
+`vagrant up`.  Once complete you will have a clean development environment
+ready to go for working with Validation Framework.

Vagrantfile.centos

@@ -0,0 +1,28 @@
+Vagrant.configure("2") do |config|
+  config.vm.box = "centos/8"
+  config.vm.box_version = "1905.1"
+  config.vm.provider "virtualbox" do |vb|
+    vb.memory = "2048"
+  end
+  config.vm.provision "shell", inline: <<-SHELL
+    echo "export TERM=xterm">>/home/vagrant/.bashrc
+    echo "export TERM=xterm">>/root/.bashrc
+    dnf update -y
+    dnf install -y epel-release
+    yum-config-manager --disable epel
+    dnf install -y python3-devel gcc git vim
+    dnf install -y --enablerepo epel ansible
+    git clone https://opendev.org/openstack/validations-libs
+    git clone https://opendev.org/openstack/validations-common
+    pushd validations-libs
+    sudo -u vagrant pip3 install --user -r requirements.txt
+    python3 setup.py install
+    popd
+    pushd validations-common
+    sudo -u vagrant pip3 install --user -r requirements.txt
+    python3 setup.py install
+    popd
+    ln -s /usr/local/share/ansible/validations-playbooks /usr/share/ansible/validations-playbooks
+    mkdir -p /var/log/validations
+  SHELL
+end

Vagrantfile.ubuntu

@@ -0,0 +1,25 @@
+Vagrant.configure("2") do |config|
+  config.vm.box = "ubuntu/focal64"
+  config.vm.provider "virtualbox" do |vb|
+    vb.memory = "2048"
+  end
+  config.vm.provision "shell", inline: <<-SHELL
+    echo "export TERM=xterm">>/home/vagrant/.bashrc
+    echo "export TERM=xterm">>/root/.bashrc
+    apt-get -y update
+    apt-get -y upgrade
+    apt-get -y install ansible git python3-pip vim
+    git clone https://opendev.org/openstack/validations-libs
+    git clone https://opendev.org/openstack/validations-common
+    pushd validations-libs
+    pip3 install -r requirements.txt
+    python3 setup.py install
+    popd
+    pushd validations-common
+    pip3 install -r requirements.txt
+    python3 setup.py install
+    popd
+    ln -s /usr/local/share/validations-common /usr/share/validations-common
+    mkdir -p /var/log/validations
+  SHELL
+end