Replaced internal services with pod watching. (#39)

Replaced internal services with pod watching.

Before this PR, weavelets communicated with one another via a Kubernetes
service. This had two problems. First, a weavelet would try to contact
the service before any backing pods started, which led to crashes.
Second, a weavelet would contact the service to get an IP address and
then use this IP address for all future calls, effectively bypassing our
load balancing entirely.

This PR fixes the issues by directly watching pods and getting their IP
addresses rather than using a service. I believe the internal services
we generate are now not needed, but I need to double check and will
delete it in a future PR.

go.mod

@@ -9,42 +9,59 @@ require (
 	go.opentelemetry.io/otel/sdk v1.16.0
 	golang.org/x/exp v0.0.0-20230713183714-613f0c0eb8a1
 	google.golang.org/protobuf v1.31.0
-	k8s.io/api v0.26.2
-	k8s.io/apimachinery v0.27.2
+	k8s.io/api v0.27.4
+	k8s.io/apimachinery v0.27.4
+	k8s.io/client-go v0.27.4
 	sigs.k8s.io/yaml v1.3.0
 )
 
 require (
 	github.com/BurntSushi/toml v1.3.2 // indirect
 	github.com/antlr/antlr4/runtime/Go/antlr/v4 v4.0.0-20230305170008-8188dc5388df // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/emicklei/go-restful/v3 v3.9.0 // indirect
 	github.com/fsnotify/fsnotify v1.6.0 // indirect
 	github.com/go-logr/logr v1.2.4 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-openapi/jsonpointer v0.19.6 // indirect
+	github.com/go-openapi/jsonreference v0.20.1 // indirect
+	github.com/go-openapi/swag v0.22.3 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/google/cel-go v0.17.1 // indirect
+	github.com/google/gnostic v0.5.7-v3refs // indirect
+	github.com/google/go-cmp v0.5.9 // indirect
 	github.com/google/gofuzz v1.2.0 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mattn/go-isatty v0.0.16 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/stoewer/go-strcase v1.2.0 // indirect
 	go.opentelemetry.io/otel v1.16.0 // indirect
 	go.opentelemetry.io/otel/metric v1.16.0 // indirect
 	go.opentelemetry.io/otel/trace v1.16.0 // indirect
 	golang.org/x/mod v0.12.0 // indirect
 	golang.org/x/net v0.12.0 // indirect
+	golang.org/x/oauth2 v0.0.0-20220223155221-ee480838109b // indirect
 	golang.org/x/sync v0.3.0 // indirect
 	golang.org/x/sys v0.10.0 // indirect
 	golang.org/x/term v0.10.0 // indirect
 	golang.org/x/text v0.11.0 // indirect
+	golang.org/x/time v0.0.0-20220210224613-90d013bbcef8 // indirect
 	golang.org/x/tools v0.11.0 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
 	google.golang.org/genproto v0.0.0-20230306155012-7f2fa6fef1f4 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 	k8s.io/klog/v2 v2.90.1 // indirect
+	k8s.io/kube-openapi v0.0.0-20230501164219-8b0f38b5fd1f // indirect
 	k8s.io/utils v0.0.0-20230220204549-a5ecb0141aa5 // indirect
 	lukechampine.com/uint128 v1.2.0 // indirect
 	modernc.org/cc/v3 v3.40.0 // indirect