Remove get_fd_list and get_vd_list from rtud's minipc since they're not used
anymore. Rtud's clients use now shmem to get the same information.
Remove helper functions from rtu_fd.c as not needed:
-rtu_fd_lookup_htab_entry
-rtu_vlan_entry_get
-vlan_entry_rd

Additionally following structures were removed as not needed:
-rtudexp_fd_entry_t
-rtudexp_fd_list_t
-rtudexp_vd_entry_t
-rtudexp_vd_list_t
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>