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In bionic, when exporting env variables, the env list displays variables in unsorted format. While fetching we are getting 'https_proxy' before 'http_proxy' which is failing in comparison to our expected values[1]. This patch sorts the variables fetched from env. [1] http://logs.openstack.org/30/643130/3/check/devstack-unit-tests/effbf7a/job-output.txt.gz#_2019-03-13_23_12_35_465026 Change-Id: Ie504eabf0d3fec1b97bc711e2702c06bcf75d158