log: Replace glog with a new logging module

glog works fine and has great features, but it does not play along well
with systemd or standard log rotators (as it does the rotation itself).

So this patch replaces glog with a new logging module "log", which by
default logs to stderr, in a systemd-friendly manner.

Logging to files or syslog is still supported.

test/t-01-simple_local/run.sh

@@ -10,7 +10,7 @@ add_user user@testserver secretpassword
 add_user someone@testserver secretpassword
 
 mkdir -p .logs
-chasquid -v=2 --log_dir=.logs --config_dir=config &
+chasquid -v=2 --logfile=.logs/chasquid.log --config_dir=config &
 wait_until_ready 1025
 
 run_msmtp someone@testserver < content

test/t-02-exim/run.sh

@@ -45,7 +45,7 @@ add_user someone@srv-chasquid secretpassword
 # Use outgoing port 2025 which is where exim will be at.
 # Bypass MX lookup, so it can find srv-exim (via our host alias).
 mkdir -p .logs
-chasquid -v=2 --log_dir=.logs --config_dir=config \
+chasquid -v=2 --logfile=.logs/chasquid.log --config_dir=config \
 	--testing__outgoing_smtp_port=2025 &
 
 wait_until_ready 1025

test/t-03-queue_persistency/run.sh

@@ -14,7 +14,7 @@ go run addtoqueue.go --queue_dir=.data/queue \
 generate_certs_for testserver
 
 mkdir -p .logs
-chasquid -v=2 --log_dir=.logs --config_dir=config &
+chasquid -v=2 --logfile=.logs/chasquid.log --config_dir=config &
 wait_until_ready 1025
 
 # Check that the item in the queue was delivered.

test/t-04-aliases/run.sh

@@ -9,7 +9,7 @@ generate_certs_for testserver
 add_user user@testserver secretpassword
 
 mkdir -p .logs
-chasquid -v=2 --log_dir=.logs --config_dir=config &
+chasquid -v=2 --logfile=.logs/chasquid.log --config_dir=config &
 wait_until_ready 1025
 
 function send_and_check() {

test/t-05-null_address/run.sh

@@ -9,7 +9,7 @@ generate_certs_for testserver
 add_user user@testserver secretpassword
 
 mkdir -p .logs
-chasquid -v=2 --log_dir=.logs --config_dir=config &
+chasquid -v=2 --logfile=.logs/chasquid.log --config_dir=config &
 wait_until_ready 1025
 
 

test/t-06-idna/run.sh

@@ -23,9 +23,9 @@ CONFDIR=B add_user nadaB@nadaB nadaB
 
 mkdir -p .logs-A .logs-B
 
-chasquid -v=2 --log_dir=.logs-A --config_dir=A \
+chasquid -v=2 --logfile=.logs-A/chasquid.log --config_dir=A \
 	--testing__outgoing_smtp_port=2025 &
-chasquid -v=2 --log_dir=.logs-B --config_dir=B \
+chasquid -v=2 --logfile=.logs-B/chasquid.log --config_dir=B \
 	--testing__outgoing_smtp_port=1025 &
 
 wait_until_ready 1025

test/t-07-smtputf8/run.sh

@@ -21,7 +21,7 @@ add_user ñangapirí@ñoñOS antaño
 add_user nada@nada nada
 
 mkdir -p .logs
-chasquid -v=2 --log_dir=.logs --config_dir=config &
+chasquid -v=2 --logfile=.logs/chasquid.log --config_dir=config &
 wait_until_ready 1025
 
 # The envelope from and to are taken from the content, and use a mix of upper

test/t-09-loop/run.sh

@@ -21,9 +21,9 @@ CONFDIR=B generate_certs_for srv-B
 
 mkdir -p .logs-A .logs-B
 
-chasquid -v=2 --log_dir=.logs-A --config_dir=A \
+chasquid -v=2 --logfile=.logs-A/chasquid.log --config_dir=A \
 	--testing__outgoing_smtp_port=2025 &
-chasquid -v=2 --log_dir=.logs-B --config_dir=B \
+chasquid -v=2 --logfile=.logs-B/chasquid.log --config_dir=B \
 	--testing__outgoing_smtp_port=1025 &
 
 wait_until_ready 1025

test/t-10-hooks/run.sh

@@ -11,7 +11,7 @@ add_user someone@testserver secretpassword
 add_user blockme@testserver secretpassword
 
 mkdir -p .logs
-chasquid -v=2 --log_dir=.logs --config_dir=config &
+chasquid -v=2 --logfile=.logs/chasquid.log --config_dir=config &
 wait_until_ready 1025
 
 cp config/hooks/post-data.good config/hooks/post-data