Be consistent and make active_users active_user_count

app/workers/gitlab_usage_ping_worker.rb

@@ -30,7 +30,7 @@ class GitlabUsagePingWorker
 
   def data
     usage_data = { version: Gitlab::VERSION,
-                   active_users: current_active_user_count }
+                   active_user_count: current_active_user_count }
     license = License.current
 
     if license

spec/workers/gitlab_usage_ping_worker_spec.rb

@@ -10,7 +10,7 @@ describe GitlabUsagePingWorker do
     expect(data[:license_md5]).to eq(Digest::MD5.hexdigest(license.data))
     expect(data[:version]).to eq(Gitlab::VERSION)
     expect(data[:licensee]).to eq(license.licensee)
-    expect(data[:active_users]).to eq(User.active.count)
+    expect(data[:active_user_count]).to eq(User.active.count)
     expect(data[:licensee]).to eq(license.licensee)
     expect(data[:license_user_count]).to eq(license.user_count)
     expect(data[:license_starts_at]).to eq(license.starts_at)