Support LDAP authentication with unauthorized reads

[JonasScharpf]

This PR is based on #101 and resolves #100

It provides unauthorized reads when using LDAP, config via command line args and minimal config file testing for the new LDAP section

This is my first GO thing ever, so it might not be perfect

[mostynb]

Not bad, for first-time go code :) I will look some more tomorrow.

I wonder if there's a small ldap server we could spin up during an end-to-end test? https://github.com/bradleypeabody/godap might work.

[JonasScharpf]

so I've fixed your remarks and added a end-to-end fake LDAP server test. But the remaining golangci linter errors are beyond my knowledge to fix them by myself.
I have to admit that I simply copied the httpServer thing from an example ...

[mostynb]

so I've fixed your remarks and added a end-to-end fake LDAP server test. But the remaining golangci linter errors are beyond my knowledge to fix them by myself. I have to admit that I simply copied the httpServer thing from an example ...

Sorry it took me longer than expected to get back to this. I should have some time to read through this while I'm travelling later this week.

[JonasScharpf]

Hey @mostynb how are you doing? Might it be possible to find some time for this PR during your next trip? 😉

[JonasScharpf]

@mostynb I'm sorry to ask again for your time + help with this PR, it's been now in review since almost 2 months

[mostynb]

Sorry this took me so long. I landed a modified version of this in #768. Could you please try it out?

Some of the bigger changes:

• I replaced ldap_tests.go with a shell script that uses https://github.com/glauth/glauth (.bazelci/ldap-tests.sh - it unfortunately only runs on linux at the moment)
• I had to add the BaseDN when calling Bind
• I changed the ldap.groups (slice) setting to a ldap.groups_query string