Fix hooks

[prahal]

unversioned python binary are not there anymore at least in Debian. Fix the plugin gitolite python hooks by specifying the versioned python binary it can cope with.
Note that git_multimail master 1.6dev might cope with python3 binary but current latest release of it 1.5.0 does not and that is the one we ship.
Shipping 1.6dev of it would require checking it is python3 ready.
Also note that git_mulitmail upstream does not version its python binary either.

[PowerKiKi]

Thank you for your work and patience

[n-rodriguez]

Also note that git_mulitmail upstream does not version its python binary either.

if you want to solve this issue you can adapt the code :

1. add a template true to https://github.com/jbox-web/redmine_git_hosting/blob/master/lib/load_gitolite_hooks.rb#L64
2. define a new template field here : https://github.com/jbox-web/redmine_git_hosting/blob/master/lib/redmine_git_hosting/gitolite_hook.rb#L17
3. hook into install_hook_file to do the ERB template rendering between the read and the write
4. you will need to store the desired target python version in settings

cheers!

[PowerKiKi]

I'd rather have upstream fix their code by raising their requirements to a non-abandoned python version