create a utility to read and return file contents

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
create a mon keyring in a helper function

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
create a mon keyring if not found when deploying a mon

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
Merge pull request #248 from alfredodeza/9662

create a `{cluster}.mon.keyring` file if it doesn't exist
1.5.18
update the changelog

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
bump the version

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
1.5.18
add a title to the changelog

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>