iosxr_users: fix type validation for groups

[vincentbernat]

SUMMARY

Following the documentation, groups should be a list of strings.
Moreover, the code also assume this is a list of strings (iterate on
it and append to a string). However, when providing a list of strings,
the module complains it expects a list of dict:

Elements value for option groups is of type <class 'str'> and we were
unable to convert to dict: dictionary requested, could not parse JSON
or key=value

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

iosxr_user

[rohitthakur2590]

Hi!

Thanks very much for your interest in Ansible. It sincerely means a lot to us.

This appears to be fixed in #62 with updated documentation.