Integration test: reconfig app org

Submit a reconfig TX on the orderer+committer docker network.

Use a config TX that does not require admin intervention - add app org
Use a config TX that does not require admin intervention - add known cert to app org
Use a config TX that does not require admin intervention - remove app org

Verify the assembler commit it
Verify the committer applies it
- pops in the notification service
- modified org is active / inactive respectively.

Start by locating the integration-test entry point that runs on the orderer+committer Docker network, then trace the assembler and committer handling for reconfiguration transactions. Cover adding a known certificate, adding an app organization, and removing it without admin intervention. Done means the assembler commits each transaction, the committer applies it, notifications appear, and the modified organization becomes active or inactive as expected.

Written by the indexing model from the issue text.