Log to stderr by turning off the log file collector

Fixes ManageIQ/container-postgresql#40

Drop the no longer used options for logging to a file.

Related: CrunchyData/postgres-operator#1141 (comment)

manageiq-operator/api/v1alpha1/helpers/miq-components/postgresql_conf.go

@@ -38,8 +38,10 @@ hot_standby = on
 # ERROR REPORTING AND LOGGING
 #------------------------------------------------------------------------------
 
-log_filename = 'postgresql.log'
-log_rotation_age = 0
+log_destination = 'stderr'
+# This is used when logging to stderr:
+logging_collector = off
+
 log_min_duration_statement = 5000
 log_connections = on
 log_disconnections = on