Add Wallaby election stats

Update the election stats data for Wallaby TC and Telemetry PTL
polls. Also add the missing train PTL poll stats.

Change-Id: I6a08a1109cb0fe0efd898ed9f9c8c54364fbff21

doc/source/results/train/ptl.yaml

@@ -373,6 +373,13 @@ election: train
 elections_results:
   Nova: https://civs.cs.cornell.edu/cgi-bin/results.pl?id=E_b03df704c3012e18
   OpenStack_Charms: https://civs.cs.cornell.edu/cgi-bin/results.pl?id=E_ca2c11f0f83ce84d
+election_statistics:
+  - Nova:
+      electorate: 194
+      votes_cast: 81
+  - OpenStack_Charms:
+      electorate: 68
+      votes_cast: 23
 leaderless:
 - PowerVMStackers
 - Telemetry

doc/source/results/wallaby/ptl.yaml

@@ -277,6 +277,10 @@ candidates:
 election: wallaby
 elections_results:
   Telemetry: https://civs.cs.cornell.edu/cgi-bin/results.pl?id=E_2428aa2ecc67cc17
+election_statistics:
+  - Telemetry:
+      electorate: 27
+      votes_cast: 14
 leaderless:
 - Packaging_Rpm
 - Placement

tools/tc-election-summary.py

@@ -94,6 +94,12 @@ data = [
         'votes_cast': 208,
         'results': '%s?id=%s' % (CIVS_BASE, 'E_95cb11614fb23566')
     },
+    {
+        'election': '10/2020',  # Wallaby
+        'electorate': 619,
+        'votes_cast': 181,
+        'results': '%s?id=%s' % (CIVS_BASE, 'E_f3d92f86f4254553')
+    },
 ]