pgagroal-cli minor bug fixes

In the past days I pushed a few troophy patches to pgagroal-cli, the command line tool to administer a pgagroal connection pooler, in order to fix minor issues that produced unattended results. The bug were all harmless, since they only affected what the pgagroal-cli was producing as output to the user, but could have been confusing for some use cases, hence the need to fix them. There is quite a momentum around the pgagroal project, and the activity around the issues has increased with the arrival of new contributors!