Some fixes for travis ci and cdp

remove cmd package from travis (it's complaining because
there are no tests), and add apt-get update for cdp.

.travis.yml

@@ -17,4 +17,4 @@ install:
   - make deps
 
 script:
-  - travis_wait 20 goveralls -service=travis-ci -package ./pkg/... -package ./cmd/... -v
+  - travis_wait 20 goveralls -service=travis-ci -package ./pkg/... -v

delivery.yaml

@@ -6,6 +6,9 @@ pipeline:
         GOPATH: /root/go
         OPERATOR_TOP_DIR: /root/go/src/github.com/zalando-incubator
       commands:
+        - desc: 'Update'
+          cmd: |
+            apt-get update
         - desc: 'Install required build software'
           cmd: |
             apt-get install -y make git apt-transport-https ca-certificates curl