Fix bad references to datetime.now()

now() is a method in the "datetime" class of the
"datetime" module; at the top we were importing the
"datetime" module but later overwriting it with the
"datetime" class ("from datetime import datetime").

This means "datetime.datetime.now()" should actually
be called as "datetime.now()"; also removed the
misleading "import datetime"

distrepos/__main__.py

@@ -26,7 +26,6 @@
 separate repositories even though the files are mixed together.
 """
 
-import datetime
 import logging
 import sys
 import typing as t
@@ -128,7 +127,7 @@ def rsync_repos(options: Options, tags: t.Sequence[Tag]) -> int:
     _log.info("Program started")
     check_rsync(options.koji_rsync)
     _log.info("rsync check successful. Starting run for %d tags", len(tags))
-    total_start_time = datetime.datetime.now()
+    total_start_time = datetime.now()
 
     # Run each tag defined in the config file.  Tags are run in series.
     # Keep track of successes and failures.
@@ -147,17 +146,17 @@ def rsync_repos(options: Options, tags: t.Sequence[Tag]) -> int:
                 destroot=options.dest_root,
             ),
         )
-        tag_start_time = datetime.datetime.now()
+        tag_start_time = datetime.now()
         ok, err = run_one_tag(options, tag)
-        tag_elapsed_time = datetime.datetime.now() - tag_start_time
+        tag_elapsed_time = datetime.now() - tag_start_time
         if ok:
             _log.info("Tag %s completed in %s", tag.name, tag_elapsed_time)
             successful.append(tag)
         else:
             _log.error("Tag %s failed in %s", tag.name, tag_elapsed_time)
             failed.append((tag, err))
 
-    total_elapsed_time = datetime.datetime.now() - total_start_time
+    total_elapsed_time = datetime.now() - total_start_time
     _log.info("----------------------------------------")
     _log.info("Run completed in %s", total_elapsed_time)