tof-voters: begin tool for voter membership

The TOF voting requires looking at Gerrit data to determine who is
eligible to vote.  Start a tool that can be used to dump and analyze
this data.

First sub-command added is a method to dump all Gerrit data after a
certain date (typically the cut-off for the previous election).

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I02b22c9dcb81b570ac3872d7c38f838d61690c83
diff --git a/tof-voters/.gitignore b/tof-voters/.gitignore
new file mode 100644
index 0000000..1269488
--- /dev/null
+++ b/tof-voters/.gitignore
@@ -0,0 +1 @@
+data