Show exception stacktraces when we handle exceptions

For a KeyError, print(e) just prints the key name that wasn't found.
That's not even remotely helpful/obvious. Now we get a stacktrace and
the usual "KeyError: foo" message, which is much better and actually
what I wanted when I changed this.
Signed-off-by: Florian Pritz <bluewind@xinu.at>

upload_pkg_internetarchive.py

@@ -4,6 +4,7 @@ import sys
 import os
 import re
 import tarfile
+import traceback
 
 import internetarchive as ia
 
@@ -98,7 +99,7 @@ class ArchiveUploader:
                     returncode = 1
             except Exception as e:
                 print(f"{identifier}: exception raised", file=sys.stderr)
-                print(e, file=sys.stderr)
+                print(traceback.format_exc(), file=sys.stderr)
                 print(directory)
                 returncode = 1
 
@@ -126,7 +127,7 @@ class ArchiveUploader:
                     exitcode = 1
             except Exception as e:
                 print(f"{identifier}: exception raised", file=sys.stderr)
-                print(e, file=sys.stderr)
+                print(traceback.format_exc(), file=sys.stderr)
                 print(pkg_dir)
                 exitcode = 1
         return exitcode