Fission metrics integration (#677)

Add prometheus metrics collection endpoints to router and executor. Add prometheus annotations to router and executor pods.

glide.lock

@@ -3,6 +3,12 @@ updated: 2018-03-23T17:49:04.748453691-07:00
 imports:
 - name: cloud.google.com/go
   version: 3b1ae45394a234c385be014e9a488f2bb6eef821
+- name: github.com/beorn7/perks
+  version: 4c0e84591b9aa9e6dcfdf3e020114cd81f89d5f9
+  subpackages:
+  - quantile
+- name: github.com/blang/semver
+  version: 60ec3488bfea7cca02b021d106d9911120d25fe9
   subpackages:
   - compute/metadata
   - internal
@@ -153,6 +159,31 @@ imports:
   - xxHash32
 - name: github.com/pkg/errors
   version: f15c970de5b76fac0b59abb32d62c17cc7bed265
+- name: github.com/matttproud/golang_protobuf_extensions
+  version: c12348ce28de40eed0136aa2b644d0ee0650e56c
+  subpackages:
+  - pbutil
+- name: github.com/pborman/uuid
+  version: 3d4f2ba23642d3cfd06bd4b54cf03d99d95c0f1b
+- name: github.com/prometheus/client_golang
+  version: c5b7fccd204277076155f10851dad72b76a49317
+  subpackages:
+  - prometheus
+  - prometheus/promhttp
+- name: github.com/prometheus/client_model
+  version: 6f3806018612930941127f2a7c6c453ba2c527d2
+  subpackages:
+  - go
+- name: github.com/prometheus/common
+  version: 13ba4ddd0caa9c28ca7b7bffe1dfa9ed8d5ef207
+  subpackages:
+  - expfmt
+  - internal/bitbucket.org/ww/goautoneg
+  - model
+- name: github.com/prometheus/procfs
+  version: 65c1f6f8f0fc1e2185eb9863a3bc751496404259
+  subpackages:
+  - xfs
 - name: github.com/PuerkitoBio/purell
   version: 8a290539e2e8629dbc4e6bad948158f790ec31f4
 - name: github.com/PuerkitoBio/urlesc