moved provision instance to users and keep compatibility in samba
add temporary depend on zentyal-samba

until both modules are decoupled or joined
Drop Users::LDAP in favor of Samba::LDB (merging some stuff)
rename EBox::LDB to EBox::Ldap for compatibility with all the modules using it
fixed unit tets again

and move IdMapDB to users
merge LdapObject in LdbObject
rename LdbObject to LdapObject for compatibility with existing code
added transitional dummy LdbObject class
move LdbObject unit tests to LdapObject
fix unit tests again