Initial support for Jaeger & OpenTracing (#410)

Jaeger can be installed optionally. To install, add
```
jaeger:
  enabled: true
```
to install.yaml

**Changes**:
* adds `jaeger-client` dependency
* adds optional `--tracer` flag to every service
* adds utility function/wrapper to create a tracer
* adds jaeger installation logic to `dispatch install`
* adds HTTP middleware to inject tracing context
* sets minimal supported version of Kafka to 0.11 to support message
headers

**Testing**:
Manually tested that jaeger works (once db situation is resolved, we can
enable jaeger in every deployment)

Author: kars7e

Gopkg.lock

@@ -69,10 +69,6 @@
   name = "k8s.io/client-go"
   version = "kubernetes-1.9.1"
 
-[[constraint]]
-  name = "k8s.io/code-generator"
-  version = "kubernetes-1.9.1"
-
 [[constraint]]
   name = "github.com/sirupsen/logrus"
   version = "v1.0.3"

Gopkg.toml

@@ -41,6 +41,7 @@ spec:
             - "--gateway-host={{ .Values.gateway.host }}"
             - "--function-manager={{ .Release.Name }}-function-manager.{{ .Release.Namespace }}"
             - "--resync-period={{ .Values.resyncPeriod }}"
+            - "--tracer={{ .Values.global.tracer.endpoint }}"
             {{- if .Values.global.debug }}
             - "--debug"
             {{- end }}

charts/dispatch/charts/api-manager/templates/deployment.yaml

@@ -37,6 +37,7 @@ spec:
             - "--tls-port=443"
             - "--tls-certificate=/data/tls/tls.crt"
             - "--tls-key=/data/tls/tls.key"
+            - "--tracer={{ .Values.global.tracer.endpoint }}"
             {{- if .Values.global.debug }}
             - "--debug"
             {{- end }}

charts/dispatch/charts/application-manager/templates/deployment.yaml

@@ -49,6 +49,7 @@ spec:
             - "--tls-port=443"
             - "--tls-certificate=/data/tls/tls.crt"
             - "--tls-key=/data/tls/tls.key"
+            - "--tracer={{ .Values.global.tracer.endpoint }}"
             {{- if .Values.global.debug }}
             - "--debug"
             {{- end }}

charts/dispatch/charts/event-manager/templates/deployment.yaml

@@ -42,6 +42,7 @@ spec:
             - "--tls-port=443"
             - "--tls-certificate=/data/tls/tls.crt"
             - "--tls-key=/data/tls/tls.key"
+            - "--tracer={{ .Values.global.tracer.endpoint }}"
             {{- if .Values.global.debug }}
             - "--debug"
             {{- end }}

charts/dispatch/charts/function-manager/templates/deployment.yaml

@@ -39,6 +39,7 @@ spec:
             - "--tls-certificate=/data/tls/tls.crt"
             - "--tls-key=/data/tls/tls.key"
             - "--oauth2-proxy-auth-url=http://localhost:{{ .Values.oauth2proxy.service.internalPort }}/v1/iam/oauth2/auth"
+            - "--tracer={{ .Values.global.tracer.endpoint }}"
             {{- if .Values.global.skipAuth }}
             - "--skip-auth"
             {{- end }}

charts/dispatch/charts/identity-manager/templates/deployment.yaml

@@ -38,6 +38,7 @@ spec:
             - "--tls-port=443"
             - "--tls-certificate=/data/tls/tls.crt"
             - "--tls-key=/data/tls/tls.key"
+            - "--tracer={{ .Values.global.tracer.endpoint }}"
             {{- if .Values.global.debug }}
             - "--debug"
             {{- end }}

charts/dispatch/charts/image-manager/templates/deployment.yaml

@@ -39,6 +39,7 @@ spec:
             - "--db-username={{ .Values.global.db.user }}"
             - "--db-password={{ .Values.global.db.password }}"
             - "--db-database={{ .Values.global.db.database }}"
+            - "--tracer={{ .Values.global.tracer.endpoint }}"
             {{- if .Values.global.debug }}
             - "--debug"
             {{- end }}

charts/dispatch/charts/secret-store/templates/deployment.yaml

@@ -40,6 +40,7 @@ spec:
             - "--db-password={{ .Values.global.db.password }}"
             - "--db-database={{ .Values.global.db.database }}"
             - "--secret-store={{ .Release.Name }}-secret-store"
+            - "--tracer={{ .Values.global.tracer.endpoint }}"
             {{- if .Values.global.debug }}
             - "--debug"
             {{- end }}