Alexander Kukushkin 0b1b1e3b54 Compatibility with postgresql 12 (#1068) ...

* use `SHOW primary_conninfo` instead of parsing config file on pg12
* strip out standby and recovery parameters from postgresql.auto.conf before starting the postgres 12

Patroni config remains backward compatible.
Despite for example `restore_command` converted to a GUC starting from postgresql 12, in the Patroni configuration you can still keep it in the `postgresql.recovery_conf` section.
If you put it into `postgresql.parameters.restore_command`, that will also work, but it is important not to mix both ways:
```yaml
# is OK
postgresql:
  parameters:
    restore_command: my_restore_command
    archive_cleanup_command: my_archive_cleanup_command

# is OK
postgresql:
  recovery_conf:
    restore_command: my_restore_command
    archive_cleanup_command: my_archive_cleanup_command

# is NOT ok
postgresql:
  parameters:
    restore_command: my_restore_command
  recovery_conf:
    archive_cleanup_command: my_archive_cleanup_command
```

2019-08-02 16:00:55 +02:00

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