Revert "Add Experimental filters for smudging/cleaning the SOA serial"

This reverts commit 331df2a4ec.
Increasing serial during the cleaning phase does not work as expected.
Maybe the way is to smudge serial to current unix time during checkout
on the server.

dzonegit.py

@@ -14,9 +14,6 @@ from pathlib import Path
 from string import Template
 
 
-SERIAL_SMUDGE_TAG = "DZONEGIT_DO_NOT_CHANGE_OLD_SERIAL_"
-
-
 class HookException(ValueError):
     """Exception raised when there is an error in input data.
 
@@ -496,32 +493,3 @@ def post_receive(stdin=sys.stdin):
                     cmd.append(z)
                     print("Calling {}…".format(" ".join(cmd)))
                     subprocess.run(cmd)
-
-
-def clean_serial(stdin=sys.stdin):
-    """ Git filter command to replace smudged serial with an increased one. """
-    for line in stdin:
-        m = re.search(
-            r"(\s){}([0-9]+)(\s)".format(SERIAL_SMUDGE_TAG),
-            line,
-        )
-        if m:
-            oldserial = m.group(2)
-            newserial = get_increased_serial(oldserial)
-            line = line.replace(SERIAL_SMUDGE_TAG + oldserial, newserial)
-        print(line, end="")
-
-
-def smudge_serial(stdin=sys.stdin):
-    """ Git filter command to smudge SOA serial number. """
-    sys.stderr.write("Smudging {}…\n".format(sys.argv))
-    zonedata = stdin.read()
-    if SERIAL_SMUDGE_TAG not in zonedata:
-        zonedata = re.sub(
-            r'(^.*\sSOA\s.+?\s)([0-9]+[^0-9])',
-            r'\g<1>{}\g<2>'.format(SERIAL_SMUDGE_TAG),
-            zonedata,
-            count=1,
-            flags=re.DOTALL | re.IGNORECASE | re.MULTILINE,
-        )
-    print(zonedata, end="")