all: Update auth module plugin with expected auth message list and add retry fail catch

[marcelmamula]

Changes

Resolves issues reported in #62

• Add list of potential messages indicating that this is authentication issue in ansible modules.

        auth_error_messages = [
            'could not authenticate you',
            "couldn't authenticate you",
            'authentication failed',
            'invalid credentials',
            'incorrect username or password'
        ]

• Add retry counter that will check if retry happened on same endpoint and fail after 3 attempts. This solves issue when authentication message list does not contain auth error.

    msg: Authentication failed due to invalid credentials. Please verify your S-User ID
        and password are correct. If this error persists with valid credentials, the authentication
        error format may have changed.

Tests

Tested on SLES_SAP 16.0 using valid and invalid credentials.