Add readable logs for Access Control Setup

[kushagra189]

Currently, post registering permissions there are no client readable log lines to confirm if all the steps were successfully completed in the access control flow.

From a boilerplate code perspective follow log lines are required in order to provide more informations to the clients leveraging FOCA for building/setting up app directories.

1. Add log line to confirm enforcer has been registered - https://github.com/elixir-cloud-aai/foca/blob/dev/foca/security/access_control/register_access_control.py#L85
2. Add log line to confirm permission specs have been registered - https://github.com/elixir-cloud-aai/foca/blob/dev/foca/security/access_control/register_access_control.py#L90
3. Add log line to confirm access control registration confirmation - https://github.com/elixir-cloud-aai/foca/blob/dev/foca/foca.py#L151