doc/scapy is not reproducibly built

Brief description

Hi

There is an ongoing effort regarding reproducible builds in Debian so we have tests checking for it. scapy - actually python-scapy-doc package which contains scapy's documentation - is currently not building reproducibly. There are some places where the date/time of the build is embedded and others are randomly generated.

The html pages that differ are:

• html/api/scapy.contrib.dtp.html
• html/api/scapy.contrib.gtp.html
• html/api/scapy.contrib.http2.html
• html/api/scapy.contrib.skinny.html
• html/api/scapy.layers.inet.html
• html/api/scapy.layers.kerberos.html
• html/api/scapy.layers.snmp.html
• html/api/scapy.layers.x509.html

I'll attach the diffoscope output here because github doesn't let me paste it ;-)

experiment-1.diffoscope.txt

Scapy version

2.5.0

Python version

3.10

Operating system

Debian unstable

Additional environment information

No response

How to reproduce

Diffoscope two different builds of scapy's documentation

Actual result

No response

Expected result

No response

Related resources

No response

Start by comparing two documentation builds with diffoscope, using the attached output and the listed HTML pages as the investigation points. Trace the differing date/time and randomly generated values back to their build inputs. Done means repeated builds produce identical documentation and the Debian reproducibility check passes.