Remove warning of pytest for rewriting modules

Cause we are loading config and defaults from our run_ocsci.py wrapper
we need to add PYTEST_DONT_REWRITE msg to dosctring of modules where we
don't want to see warning.

Documentation:
https://docs.pytest.org/en/latest/reference.html#pytest-dont-rewrite-module-docstring

Reference where I found about this workarround is mentioned here:
pytest-dev/pytest-cov#148 (comment)

ocs/__init__.py

@@ -0,0 +1,8 @@
+"""
+Avoid already-imported warning cause of we are importing this package from
+run wrapper for loading config.
+
+You can see documentation here:
+https://docs.pytest.org/en/latest/reference.html
+under section PYTEST_DONT_REWRITE
+"""

ocs/defaults.py

@@ -1,26 +1,33 @@
 """
-Defaults module
+Defaults module.
+
+This module is automatically loaded with variables defined in
+conf/ocsci/default_config.yaml in its DEFAULTS section.
+
+If the variable can be used in some config file sections from ocsci/config.py
+module, plese put your defaults rather to mentioned default_config.yaml file!
+
+See the documentation in conf/README.md file to understand this config file.
+
+PYTEST_DONT_REWRITE - avoid pytest to rewrite, keep this msg here please!
 """
 import os
 from getpass import getuser
 
 THIS_DIR = os.path.dirname(os.path.abspath(__file__))
 TOP_DIR = os.path.dirname(THIS_DIR)
 TEMPLATE_DIR = os.path.join(TOP_DIR, "templates/ocs-deployment/")
+STORAGE_API_VERSION = 'storage.k8s.io/v1'
+ROOK_API_VERSION = 'ceph.rook.io/v1'
+OCP_API_VERSION = 'project.openshift.io/v1'
+OPENSHIFT_REST_CLIENT_API_VERSION = 'v1'
 
-# This module is automatically loaded with variables defined in
-# conf/ocsci/default_config.yaml in its DEFAULTS section.
-# If the variable can be used in some config file sections from ocsci/config.py
-# module, plese put your defaults rather to mentioned default_config.yaml file!
-
-# See the documentation in conf/README.md file to understand this config file.
-
-# Those variables are duplicate at the moment from default_config.yaml and once
-# we drop support for old runner we will remove those variables from here and
-# will have them defined only on one place.
+# Those variables below are duplicate at the moment from default_config.yaml
+# and once we drop support for old runner we will remove those variables from
+# here and will have them defined only on one place.
 
-# Be aware that variables defined below are not used anywhere in th config
-# files and their sections when we rendering config!
+# Be aware that variables defined above and below are not used anywhere in the
+# config files and their sections when we rendering config!
 
 INSTALLER_VERSION = '4.1.0-rc.3'
 CLIENT_VERSION = INSTALLER_VERSION
@@ -44,7 +51,3 @@
     'ceph_image': CEPH_IMAGE,
     'rook_image': ROOK_IMAGE,
 }
-STORAGE_API_VERSION = 'storage.k8s.io/v1'
-ROOK_API_VERSION = 'ceph.rook.io/v1'
-OCP_API_VERSION = 'project.openshift.io/v1'
-OPENSHIFT_REST_CLIENT_API_VERSION = 'v1'

ocsci/__init__.py

@@ -0,0 +1,8 @@
+"""
+Avoid already-imported warning cause of we are importing this package from
+run wrapper for loading config.
+
+You can see documentation here:
+https://docs.pytest.org/en/latest/reference.html
+under section PYTEST_DONT_REWRITE
+"""

ocsci/config.py

@@ -1,12 +1,16 @@
-# Following config variables will be loaded by ocscilib pytest plugin.
-# See the conf/ocsci/default_config.yaml for default values.
-# The data are combined from multiple sources and then exposed to the following
-# variables.
-#
-# You can see the logic in ./pytest_customization/plugins/ocscilib.py.
+"""
+Following config variables will be loaded by ocscilib pytest plugin.
+See the conf/ocsci/default_config.yaml for default values.
+The data are combined from multiple sources and then exposed to the following
+variables.
 
-# Those have lowest priority and are overwritten and filled with data loaded
-# during the config phase.
+You can see the logic in ./pytest_customization/plugins/ocscilib.py.
+
+Those have lowest priority and are overwritten and filled with data loaded
+during the config phase.
+
+PYTEST_DONT_REWRITE - avoid pytest to rewrite, keep this msg here please!
+"""
 RUN = dict(cli_params={})  # this will be filled with CLI parameters data
 DEPLOYMENT = {}  # deployment related data
 REPORTING = {}  # reporting related data