Deprecated LDAP API functions in GFAL

On SLC5, certification of the following patch failed:

https://savannah.cern.ch/patch/?3119

The error can be reproduced in the following way:

1. Check out and build org.glite.data with GFAL (instuctions here). The next steps are continuation of the linked build process.
   
2. Build the org.glite.data.dm-util package:
   
   cd ~/org.glite.data.dm-util/build
   make install
   
   
3. Execute the following commands:
   
   
   cd src
   export LCG_GFAL_INFOSYS=lcg-bdii.cern.ch:2170
   ./lcg-cr -d srm://lxb7608v1.cern.ch/dpm/cern.ch/home/dteam/test_rm_02 -D srmv2 -vv /etc/redhat-release
   

(about the LCG_GFAL_INFOSYS: see this). The command results:

Using grid catalog type: lfc
Using grid catalog : (null)
Checksum type: None
[INFO] BDII server: lcg-bdii.cern.ch:2170/o=grid
[INFO] BDII filter: (| (GlueSEUniqueID=lxb7608v1.cern.ch) (& (GlueServiceType=srm*) (GlueServiceEndpoint=*://lxb7608v1.cern.ch:*)))
[INFO] Trying to use BDII: lcg-bdii.cern.ch:2170/o=grid (timeout 60)
[BDII][ldap_search_st][] lcg-bdii.cern.ch:2170 > Bad search filter
[GFAL][bdii_query_send][EINVAL] No accessible BDII
lcg_cr: Invalid argument

That is the same result that can be seen in the bug. After analysis, we found that several LDAP C API functions got deprecated on this platform. Ideas at this point:

- We may as well create a facade to the LDAP API.
Pros: unit-testability, without real LDAP servers (mock finctionality). Future LDAP API changes are isolated.
Cons: The LDAP API does not change frequently, so probably the workload is not worth.

TODO-s:

- Change the deprecated LDAP functions
- Create a regression test for the bug
- Re-send the patch for certification.