Increase default olcLocalSSF to 128

[Ryan Tandy <ryan@nardis.ca>]

I propose increasing the default olcLocalSSF to 128. Mentioned initially 
on IRC, now bringing it to the list for completeness and archival.

In typical setups people want to require TLS *or* ldapi, and ssf=128 
seems like a pretty common olcSecurity setting for current systems.

thanks
Ryan