Add Red Hat EL8 to the list of supported OS.

Update the code that sets the $config_file_path for the Red Hat
OS family. Active releases (except EL6) all use the same config file
path, so this patch eliminates the need to update the code each time
a new OS version is released.

* Adjustment on directory creation to work with Ubuntu distribution

* Fix indent

Prep for release 1.12.2

Added headers to templates

Whacky validate

adding support for Fedora 25

added quota-backend-bytes setting to the etcd.conf.erb

added quota-backend-bytes setting to the etcd.conf.erb as it does not exist in the config but in the yml

Add value to "key-file" configuration key

Everything is the same as on CentOS 7 so makes no sense why not supporting Fedora 25

Improve etcd managed by docker UX

* Synch config opts from official docs
* Add member's enable_v2, quota_backend_bytes and
  cluster's force_new_cluster config params.
* Never force_new_cluster, it is a one-shot op, it
  might be destructive for periodic configuration
  management enforcement runs. Set it to False to
  protect from defaults' future changes as well.
* Add a YAML conf file and ensure it under the
  /etc/etcd/etcd.yml, owned by the etcd u/g.
  This may to be used on a user's will, e.g.:
  "docker run .. /usr/bin/etcd --config-file..."

Closes https://github.com/cristifalcas/puppet-etcd/issues/20
Related https://github.com/cristifalcas/puppet-etcd/issues/17



Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>

Allow for other discovery mechanisms

Put numeric config values as numeric

Numerics as strings cause etcd to explode
with div by zero.

Fix unit tests, drop 'pe' requirement as
it's not supported anymore in public CI.

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>

compare 'operatingsystemmajrelease' fact with string value

Fix config file variables; …