Name collision when synchronizing sub groups from Keycloak

Keycloak does not ensure uniqe group names for sub groups.
When synchronized to OpenShift the behaviour is random.

Preconditions

Given the following group strucutre in Keyckloak:
"""
* group-a
** sub-group
* group-b
** sub-group
"""
And a user named "user-a" asigned to group "group-a/sub-group"
And a user named "user-b" asigned to group "group-b/sub-group"
When the groups are sync with the option "scope" set to "sub"

Observation

Then there are the following groups:
"""
* group-a
* group-b
* sub-group
"""
And the user list of "sub-group" contains "user-a"
Or the user list of "sub-group" contains "user-b"

Note that the bahaviour is random. Depending on unknown conditions, users are synced from either "group-a/sub-group" or "group-b/sub-group".

Expectations

Then there are the following groups:
"""
* group-a
* group-b
* group-a-sub-group
* group-b-sub-group
"""
And the user list of "group-a-sub-group" contains "user-a"
And the user list of "group-b-sub-group" contains "user-b"

In the above - got used as a separator to prepend the parents group name. I suggest to have this configurable.

Start by reproducing the Keycloak synchronization scenario with the option "scope" set to "sub", using duplicate subgroup names under different parents. Trace the group-name generation and configuration entry points, then verify that parent-qualified names preserve both users and that the separator is configurable.