[Fast-Reboot]: fast-reboot-dump.py script connects to the DB by TCP (sonic-net#225)

* Check user id for fast-reboot-dump.py script

* exit with exit code 1

* Use TCP to connect to the DB. Remove check for super user as redundant

* Finnaly Remove check for super user as redundant

Author: pavel-shirshov

scripts/fast-reboot-dump.py

@@ -15,7 +15,7 @@
 ARP_PAD = binascii.unhexlify('00' * 18)
 
 def generate_arp_entries(filename, all_available_macs):
-    db = swsssdk.SonicV2Connector()
+    db = swsssdk.SonicV2Connector(host='127.0.0.1')
     db.connect(db.APPL_DB, False)   # Make one attempt only
 
     arp_output = []
@@ -148,7 +148,7 @@ def get_fdb(db, vlan_name, vlan_id, bridge_id_2_iface):
 def generate_fdb_entries(filename):
     fdb_entries = []
 
-    db = swsssdk.SonicV2Connector()
+    db = swsssdk.SonicV2Connector(host='127.0.0.1')
     db.connect(db.ASIC_DB, False)   # Make one attempt only
 
     bridge_id_2_iface = get_map_bridge_port_id_2_iface_name(db)
@@ -241,7 +241,7 @@ def get_default_entries(db, route):
     return obj
 
 def generate_default_route_entries(filename):
-    db = swsssdk.SonicV2Connector()
+    db = swsssdk.SonicV2Connector(host='127.0.0.1')
     db.connect(db.APPL_DB, False)   # Make one attempt only
 
     default_routes_output = []