Bump version to 4.1.0 after release of 4.0.0

All further features will go to 4.1.*
admin_option is not used when removing an asset member
bugfix: use default stack v4 if it is not defined in config

Fixes BC#67457032-blocker-api-calls
update micro version
Merge branch 'master' into audit_commands
increase minor version to 4.2
use bundle config method to point at local conjur-api