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/ops/sso/kube/sso.libsonnet b/ops/sso/kube/sso.libsonnet
index dbd85bb..24d5d68 100644
--- a/ops/sso/kube/sso.libsonnet
+++ b/ops/sso/kube/sso.libsonnet
@@ -111,6 +111,6 @@
 
     ingress: ns.Contain(kube.SimpleIngress("sso")) {
         hosts:: [cfg.domain],
-        target_service:: top.svc,
+        target:: top.svc,
     },
 }