Add timezone info into logs

Timestamps in the main log are currently printed in local time. This
patch adds UTC offset to the top of the log so it's possible to find out
exactly when events happen.

Fixes: https://pagure.io/pungi/issue/710
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

bin/pungi-koji

@@ -11,6 +11,7 @@ import locale
 import datetime
 import getpass
 import socket
+import time
 import pipes
 import json
 
@@ -261,6 +262,9 @@ def run_compose(compose, create_latest_link=True, latest_link_status=None):
     compose.log_info("Working directory: %s" % os.getcwd())
     compose.log_info("Command line: %s" % " ".join([pipes.quote(arg) for arg in sys.argv]))
     compose.log_info("Compose top directory: %s" % compose.topdir)
+    is_dst = time.daylight and time.localtime().tm_isdst > 0
+    compose.log_info("Current timezone offset: %s"
+                     % time.altzone if is_dst else time.timezone)
     compose.read_variants()
 
     # dump the config file