software/erp5: remove bin/2to3

we are not using this command line utility, in erp5 tests (
product/ERP5Type/tests/Python3StyleTest.py ) we are using the python
API directly, not the command line.

if developer needs to invoke 2to3 it is present in ${python:location}/bin/
10 jobs for fix/erp5-2to3 in 0 seconds
Status Job ID Name Coverage
  External
passed Cloudooo.UnitTest-Master

00:08:59

passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

00:36:30

passed SlapOS.Eggs.UnitTest-Master.Python2

00:25:02

passed SlapOS.Eggs.UnitTest-Master.Python3

00:25:10

failed SlapOS.SoftwareReleases.IntegrationTest-Master

10:05:58

passed SlapOS.Theia.ResilienceTest-Master-ERP5

09:42:39

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

00:33:13

failed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master

15:02:04

passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

00:38:19

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

00:38:28