LDAP: Fix separator for multiple attrs and ldapm

LDAP: Fix separator for multiple attrs and ldapm

Schema:
    attributetype ( NAME foo … )
    attributetype ( NAME foo1 SUP foo …)
    attributetype ( NAME foo2 SUP foo …)

Objects in Directory:
    dn: …
    foo1: foo, bar
    foo1: baz
    foo2: buz

Query and response:
    ldap://<HOST>/<BASE>?foo1?sub?<filter>
    -> foo,, bar,baz

    ldap://<HOST>/<BASE>?foo2?sub?<filter>
    -> buz

    ldap://<HOST>/<BASE>?foo1,foo2?sub?<filter>
    -> foo1="foo,, bar,baz" foo2="buz"

    ldap://<HOST>/<BASE>?foo?sub?<filter>
    -> foo,, bar,baz,buz

The same holds for ldam, but with multiple lines, for each
object one single line.