create debug_shell_enable config to enable debug shell (sonic-net#2060)

*Enable Debug shell config to enable debug shell.
Signed-off-by: Venkat Garigipati <[email protected]>

Author: VenkatCisco

orchagent/switchorch.cpp

@@ -26,6 +26,7 @@ const map<string, sai_switch_attr_t> switch_attribute_map =
     {"ecmp_hash_seed",                      SAI_SWITCH_ATTR_ECMP_DEFAULT_HASH_SEED},
     {"lag_hash_seed",                       SAI_SWITCH_ATTR_LAG_DEFAULT_HASH_SEED},
     {"fdb_aging_time",                      SAI_SWITCH_ATTR_FDB_AGING_TIME},
+    {"debug_shell_enable",                  SAI_SWITCH_ATTR_SWITCH_SHELL_ENABLE},
     {"vxlan_port",                          SAI_SWITCH_ATTR_VXLAN_DEFAULT_PORT},
     {"vxlan_router_mac",                    SAI_SWITCH_ATTR_VXLAN_DEFAULT_ROUTER_MAC}
 };
@@ -344,6 +345,10 @@ void SwitchOrch::doAppSwitchTableTask(Consumer &consumer)
                         attr.value.u32 = to_uint<uint32_t>(value);
                         break;
 
+                    case SAI_SWITCH_ATTR_SWITCH_SHELL_ENABLE:
+                        attr.value.booldata = to_uint<bool>(value);
+                        break;
+
                     case SAI_SWITCH_ATTR_VXLAN_DEFAULT_PORT:
                         attr.value.u16 = to_uint<uint16_t>(value);
                         break;