travis: Install openssl and generate server.{crt,key}

.travis.yml

@@ -8,6 +8,9 @@ sudo: false
 dist: trusty
 
 addons:
+  apt:
+    packages:
+    - openssl
   postgresql: "9.5"
 
 services:
@@ -18,6 +21,9 @@ install:
  - go get github.com/golang/lint/golint
  - go get github.com/fzipp/gocyclo
 
+before_script:
+ - openssl req -x509 -newkey rsa:4096 -keyout server.key -out server.crt -days 365 -nodes -subj /CN=localhost
+
 script:
  - ./travis-install-kafka.sh
  - ./travis-test.sh