kube: clean up SimpleIngress

Rename `target_service` to `target` to mirror Service's `target`; rename `extra_paths` to `extraPaths` to follow the camelCase convention used everywhere except for a few places in kube.upstream (assumed to be a mistake)

Change-Id: Icfcb70ef889e3359bf0391c465034817f4b70cce
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1809
Reviewed-by: q3k <q3k@hackerspace.pl>
diff --git a/app/matrix/lib/matrix.libsonnet b/app/matrix/lib/matrix.libsonnet
index 462a77d..875cd42 100644
--- a/app/matrix/lib/matrix.libsonnet
+++ b/app/matrix/lib/matrix.libsonnet
@@ -387,9 +387,9 @@
 
     ingress: kube.SimpleIngress("matrix") {
         hosts:: [cfg.webDomain],
-        target_service:: top.riotSvc,
+        target:: top.riotSvc,
         metadata+: top.metadata("matrix"),
-        extra_paths:: [
+        extraPaths:: [
             { path: "/_matrix", backend: top.synapseSvc.name_port },
         ] + (if cfg.cas.enable then [
             { path: "/_cas", backend: top.casSvc.name_port },