travis: investigate CI issues

Author: mdlayher

.travis.yml

@@ -5,6 +5,7 @@ os:
   - linux
 sudo: required
 before_install:
+  - sudo apt update
   - sudo apt install openvswitch-switch
   - sudo ovs-vsctl add-br ovsbr0
   - go get github.com/golang/lint/golint
@@ -19,4 +20,4 @@ script:
   - ./scripts/golint.sh
   - go test -race ./...
   - go test -c -race ./ovsdb
-  - sudo ./ovsdb.test -test.v
+  - sudo ./ovsdb.test -test.v