* Added check for pg_checkpoint role presence
This commit provides the needed infrastructure in `repmgr` so if the `repmgr` database
user is a member of the `pg_checkpoint` role, and inherits its privileges, there is no
need for such a user to be a superuser.
Co-authored-by: Martín Marqués <martin.marques@enterprisedb.com>
Information about using repmgr with a non-superuser was spread
throughout individual documentation systems; this commit creates
an overview of requirements and potential issues.
