ldap.py : improved data collection on Ubuntu/Debian

Add additional data collection for ldap. 

Here is unit test for the removal for the RootPW string :

ldapsearch -Q -LLL -Y EXTERNAL -H ldapi:/// -b cn=config '(!(objectClass=olcSchemaConfig))' | tail
olcLastMod: TRUE
olcRootDN: cn=admin,dc=support,dc=com
olcRootPW: {SSHA}vftTSovwVIiugSorYMSol2ITXvMJm0ad

tail sosreport*/sos_commands/ldap/configuration_minus_schemas
olcLastMod: TRUE
olcRootDN: cn=admin,dc=support,dc=com
olcRootPW: ***