[SSSD] [PATCHSET] LDAP: sanitize group name when used in filter

[Pavel Reichl]

Hello,

please see 2 simple patches attached.

I could not find function to sanitize DN so it could be used as part of 
filter (sanitize ()*/\...) so I had to write one.

  sysdb_dn_sanitize is not the right choice,

sysdb_dn_sanitize("name=expired-group(2016),cn=groups,cn=LOCAL,cn=sysdb") ->

"name\\3Dexpired-group(2016)\\,cn\\3Dgroups\\,cn\\3DLOCAL\\,cn\\3Dsysdb"

Thanks!