Added LDIF file for OLC functionality, and updated README accordingly

[oscziryak]

Since slapd.conf is being deprecated in the most recent OpenLDAP release, I rearranged the schema into the ldif format. This should work with any ldapmodify or ldapadd command. See Zytrax's explanation of OLC for more information.

[jtyr]

Thanks for your PR, @oscziryak. Firs of all, I have switched from OpenLDAP to FreeIPA. One of the main reasons was the OCL. I really liked the simple config file which was more readable than LDIF. I believe they could achieve similar benefits by implementing service reload instead of restarting the whole service.

But back to your PR. I think it would be better to keep the OCL in a different file. What about to put it in rfc2307bis.ldif and let people choose which one they want to use? Also some nice formatting like in the original .scheme file has would be nice.

[oscziryak]

Before I update the readability (good suggestion) I believe that my PR does not change the rfc2307bis.schema file, but in fact adds a new file rfc2307bis.ldif. Can you confirm?

[jtyr]

You are right. You indeed adding a new file.

[krei-se]

Can you please add this PR? Your code is the first hit on google for rfc2307bis and it would help HEAPS to just git clone it into the schema subfolder and have an ldif to import it.

Thanks a lot in advance!