lf_rssi_check.py : Indexing with multiple keys need to make single [] to double [[]]

https://stackoverflow.com/questions/60999753/pandas-future-warning-indexing-with-multiple-keys
pandas-dev/pandas#23566

Signed-off-by: Chuck SmileyRekiere <[email protected]>

Author: smileyrekiere

py-scripts/lf_rssi_check.py

@@ -1454,8 +1454,8 @@ def start(self, print_pass=False):
                     all_dl_ports_stations_df.to_csv(all_dl_port_stations_file_name)
 
                     # we should be able to add the values for each eid
-                    all_dl_ports_stations_sum_df = all_dl_ports_stations_df.groupby(['Time epoch'])['Rx-Bps','Tx-Bps','Rx-Latency','Rx-Jitter',
-                        'Ul-Rx-Goodput-bps','Ul-Rx-Rate-ll','Ul-Rx-Pkts-ll','Dl-Rx-Goodput-bps','Dl-Rx-Rate-ll','Dl-Rx-Pkts-ll'].sum()
+                    all_dl_ports_stations_sum_df = all_dl_ports_stations_df.groupby(['Time epoch'])[['Rx-Bps','Tx-Bps','Rx-Latency','Rx-Jitter',
+                        'Ul-Rx-Goodput-bps','Ul-Rx-Rate-ll','Ul-Rx-Pkts-ll','Dl-Rx-Goodput-bps','Dl-Rx-Rate-ll','Dl-Rx-Pkts-ll']].sum()
                     all_dl_ports_stations_sum_file_name = self.outfile[:-4]
                     all_dl_port_stations_sum_file_name = all_dl_ports_stations_sum_file_name + "-dl-all-eids-sum-per-interval.csv"
 
@@ -1508,8 +1508,8 @@ def start(self, print_pass=False):
                         all_ul_ports_stations_df.to_csv(all_ul_ports_stations_file_name)
 
                         # we add all the values based on the epoch time
-                        all_ul_ports_stations_sum_df = all_dl_ports_stations_df.groupby(['Time epoch'])['Rx-Bps','Tx-Bps','Rx-Latency','Rx-Jitter',
-                        'Ul-Rx-Goodput-bps','Ul-Rx-Rate-ll','Ul-Rx-Pkts-ll','Dl-Rx-Goodput-bps','Dl-Rx-Rate-ll','Dl-Rx-Pkts-ll'].sum()
+                        all_ul_ports_stations_sum_df = all_dl_ports_stations_df.groupby(['Time epoch'])[['Rx-Bps','Tx-Bps','Rx-Latency','Rx-Jitter',
+                        'Ul-Rx-Goodput-bps','Ul-Rx-Rate-ll','Ul-Rx-Pkts-ll','Dl-Rx-Goodput-bps','Dl-Rx-Rate-ll','Dl-Rx-Pkts-ll']].sum()
                         all_ul_ports_stations_sum_file_name = self.outfile[:-4]
                         all_ul_port_stations_sum_file_name = all_ul_ports_stations_sum_file_name + "-ul-all-eids-sum-per-interval.csv"