Remove limitation which prevented using exec to get  LDAP attribute names
rename radius_str2vp to radius_strpair2map

strpair2map doesn't automatically add the VPs
to the request which makes it more flexible.
Fix formatting in LDAP config file
Add default list to radius_str2tmpl
Don't leave dangling output pointer in ** out on error in radius_cp2map
Allow rlm_ldap to work with legacy type generic attributes again