I found source of the bug: python-rfc3986 is to blame (it is used by oslo-config). Version 0.2.0-2 contains bug which violates RFC3986. It was fixed in 0.2.2. Version of python-rfc3986 from zesty (0.3.1-2) fix this problem.
I believe this bug should be fixed by bumping up version of python-rfc3986 in UCA to 0.2.2 or higher.
I found source of the bug: python-rfc3986 is to blame (it is used by oslo-config). Version 0.2.0-2 contains bug which violates RFC3986. It was fixed in 0.2.2. Version of python-rfc3986 from zesty (0.3.1-2) fix this problem.
I believe this bug should be fixed by bumping up version of python-rfc3986 in UCA to 0.2.2 or higher.