Sample directory for vagrant setup with envetcd
Initial commit of sample unit file
Break-up ExecStartPre statements
Add etcd config to temporary file
Added Dockerfile containing commands to add envetcd into each docker container
Inserted usage of Dockerfile
Run envetcd and  docker run in ExecStart
Add documentation on running envetcd in systemd
Merged updates from feature/82979704_jrubin_update_envetcd_with_output_file_option
Update to include use of --output option
Sample unit file to run envetcd using systemd
[Finishes #82827528]
Merge remote-tracking branch 'origin/feature/82827528_csaturnino_use_envetcd_to_retrieve_etcd_config_data_instead_of_etcdctl'
fix whitespace issues

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>