daemons: default log destination to "automatic" rather than "stderr"

9905bcd promised in documentation that ``-`` would be stderr/syslog
autodetection, but mlog_init still treated it as stderr only.

Fixes: gromox-1.33-48-g9905bcde5
References: GXH-146

Author: jengelh

exch/http/main.cpp

@@ -104,7 +104,7 @@ static constexpr cfg_directive http_cfg_defaults[] = {
 	{"http_listen_addr", "::"},
 	{"http_listen_port", "80"},
 	{"http_listen_tls_port", "0"},
-	{"http_log_file", "-"},
+	{"http_log_file", ""},
 	{"http_log_level", "4" /* LV_NOTICE */},
 	{"http_rqbody_flush_size", "512K", CFG_SIZE, "0"},
 	{"http_rqbody_max_size", "50M", CFG_SIZE, "1"},

exch/midb/main.cpp

@@ -91,7 +91,7 @@ static constexpr cfg_directive midb_cfg_defaults[] = {
 	{"midb_hosts_allow", ""}, /* ::1 default set later during startup */
 	{"midb_listen_ip", "::1"},
 	{"midb_listen_port", "5555"},
-	{"midb_log_file", "-"},
+	{"midb_log_file", ""},
 	{"midb_log_level", "4" /* LV_NOTICE */},
 	{"midb_reload_interval", "60min", CFG_TIME, "1min", "1year"},
 	{"midb_schema_upgrades", "auto"},

exch/zcore/main.cpp

@@ -108,7 +108,7 @@ static constexpr cfg_directive zcore_cfg_defaults[] = {
 	{"x500_org_name", "Gromox default"},
 	{"zarafa_threads_num", "zcore_threads_num", CFG_ALIAS},
 	{"zcore_listen", PKGRUNDIR "/zcore.sock"},
-	{"zcore_log_file", "-"},
+	{"zcore_log_file", ""},
 	{"zcore_log_level", "4" /* LV_NOTICE */},
 	{"zcore_max_obh_per_session", "500", CFG_SIZE, "100"},
 	{"zcore_threads_num", "10", CFG_SIZE, "1", "1000"},

mda/delivery_app/main.cpp

@@ -64,7 +64,7 @@ static constexpr cfg_directive delivery_cfg_defaults[] = {
 	{"data_file_path", PKGDATADIR "/delivery:" PKGDATADIR},
 	{"dequeue_maximum_mem", "1G", CFG_SIZE, "1"},
 	{"dequeue_path", PKGSTATEQUEUEDIR},
-	{"lda_log_file", "-"},
+	{"lda_log_file", ""},
 	{"lda_log_level", "4" /* LV_NOTICE */},
 	{"running_identity", RUNNING_IDENTITY},
 	{"work_threads_max", "5", CFG_SIZE, "1"},

mda/smtp/main.cpp

@@ -87,7 +87,7 @@ static constexpr cfg_directive smtp_cfg_defaults[] = {
 	{"lda_listen_addr", "::"},
 	{"lda_listen_port", "25"},
 	{"lda_listen_tls_port", "0"},
-	{"lda_log_file", "-"},
+	{"lda_log_file", ""},
 	{"lda_log_level", "4" /* LV_NOTICE */},
 	{"lda_thread_charge_num", "400", CFG_SIZE, "4"},
 	{"lda_thread_init_num", "5", CFG_SIZE},

mra/imap/main.cpp

@@ -111,7 +111,7 @@ static constexpr cfg_directive imap_cfg_defaults[] = {
 	{"imap_listen_addr", "::"},
 	{"imap_listen_port", "143"},
 	{"imap_listen_tls_port", "0"},
-	{"imap_log_file", "-"},
+	{"imap_log_file", ""},
 	{"imap_log_level", "4" /* LV_NOTICE */},
 	{"imap_rfc9051", "1", CFG_BOOL},
 	{"imap_support_starttls", "imap_support_tls", CFG_ALIAS},

mra/pop3/main.cpp

@@ -106,7 +106,7 @@ static constexpr cfg_directive pop3_cfg_defaults[] = {
 	{"pop3_listen_addr", "::"},
 	{"pop3_listen_port", "110"},
 	{"pop3_listen_tls_port", "0"},
-	{"pop3_log_file", "-"},
+	{"pop3_log_file", ""},
 	{"pop3_log_level", "4" /* LV_NOTICE */},
 	{"pop3_support_stls", "pop3_support_tls", CFG_ALIAS},
 	{"pop3_support_tls", "false", CFG_BOOL},

tools/event.cpp

@@ -124,7 +124,7 @@ static constexpr cfg_directive event_cfg_defaults[] = {
 	{"event_hosts_allow", ""}, /* ::1 default set later during startup */
 	{"event_listen_ip", "::1"},
 	{"event_listen_port", "33333"},
-	{"event_log_file", "-"},
+	{"event_log_file", ""},
 	{"event_log_level", "4" /* LV_NOTICE */},
 	{"event_threads_num", "50", CFG_SIZE, "1", "1000"},
 	CFG_TABLE_END,

tools/timer.cpp

@@ -98,7 +98,7 @@ static constexpr cfg_directive timer_cfg_defaults[] = {
 	{"timer_hosts_allow", ""}, /* ::1 default set later during startup */
 	{"timer_listen_ip", "::1"},
 	{"timer_listen_port", "6666"},
-	{"timer_log_file", "-"},
+	{"timer_log_file", ""},
 	{"timer_log_level", "4" /* LV_NOTICE */},
 	{"timer_state_path", PKGSTATEDIR "/timer.txt"},
 	{"timer_threads_num", "50", CFG_SIZE, "5", "50"},