[ovs-git] [openvswitch/ovs] 38607a: travis: Fix OSX build on travis

[GitHub]

  Branch: refs/heads/branch-2.6
  Home:   https://github.com/openvswitch/ovs
  Commit: 38607a492de1ee4943252f5de7b23b6f65d40d07
      https://github.com/openvswitch/ovs/commit/38607a492de1ee4943252f5de7b23b6f65d40d07
  Author: William Tu <u9012063 at gmail.com>
  Date:   2017-11-01 (Wed, 01 Nov 2017)

  Changed paths:
    M .travis/osx-prepare.sh

  Log Message:
  -----------
  travis: Fix OSX build on travis

Run "brew update" before any installs.
This yields a clean build:
	https://travis-ci.org/williamtu/ovs-travis/builds/291616874

Signed-off-by: William Tu <u9012063 at gmail.com>
Acked-by: Yi-Hung Wei <yihung.wei at gmail.com>
Signed-off-by: Gurucharan Shetty <guru at ovn.org>