Don't set environment variables in tox.ini

Because of the bug [1] in tox 2.2.1 tox there's a need
to hard-code all environment variables except
the ones which are not set by Fuel CI.

This patch will be reverted as soon as [1] is fixed.

1. https://bitbucket.org/hpk42/tox/issues/285/tox-220-breaks-some-toxini-config-files

Closes-bug: #1517427
Change-Id: I32903c1fd5545ca56410789add7d9c2a8bbacba7

tools/cleanup.sh

@@ -17,7 +17,7 @@
 set -eu
 
 NAILGUN_CONFIG=$ARTIFACTS/test.yaml
-
+NAILGUN_ROOT=$FUEL_WEB_ROOT/nailgun
 
 # Sends SIGING to the running instance of Nailgun, if it exists
 kill_server() {

tools/prepare_nailgun.sh

@@ -17,6 +17,7 @@
 set -eu
 
 NAILGUN_CONFIG=$ARTIFACTS/test.yaml
+NAILGUN_ROOT=$FUEL_WEB_ROOT/nailgun
 
 err() {
     printf "%s\n" "$1" >&2

tox.ini

@@ -9,24 +9,30 @@ install_command = pip install --allow-external -U {opts} {packages}
 whitelist_externals = bash
                       oslo_debug_helper
 setenv = VIRTUAL_ENV={envdir}
-         ARTIFACTS={toxinidir}/{env:ARTIFACTS:test_run}
-         FUELCLIENT_JUNIT={env:FUELCLIENT_JUNIT:fuelclient}-{envname}.xml
-         FUELCLIENT_CUSTOM_SETTINGS={toxinidir}/{env:ARTIFACTS:test_run}/fuel_client_config.yaml
+         ARTIFACTS={toxinidir}/test_run
+         FUELCLIENT_JUNIT=fuelclient-{envname}.xml
+         FUELCLIENT_CUSTOM_SETTINGS={toxinidir}/test_run/fuel_client_config.yaml
 
          # Functional env settings
-         FUEL_WEB_CLONE={env:FUEL_WEB_CLONE:yes}
-         FUEL_WEB_REPO={env:FUEL_WEB_REPO:https://github.com/stackforge/fuel-web.git}
-         FUEL_WEB_ROOT={env:FUEL_WEB_ROOT:/tmp/fuel_web}
-         FETCH_REPO={env:FETCH_REPO:}
-         FETCH_REFSPEC={env:FETCH_REFSPEC:}
-         FUEL_COMMIT={env:FUEL_COMMIT:master}
-         NAILGUN_ROOT={env:FUEL_WEB_ROOT:/tmp/fuel_web}/nailgun
+         FUEL_WEB_CLONE=yes
+         FUEL_WEB_REPO=https://github.com/stackforge/fuel-web.git
+         FETCH_REPO=
+         FETCH_REFSPEC=
+         FUEL_COMMIT=master
+         NAILGUN_ROOT=/tmp/fuel_web/nailgun
 
          # Nailgun server parameters
-         NAILGUN_PORT={env:NAILGUN_PORT:8003}
-         NAILGUN_CHECK_PATH={env:NAILGUN_CHECK_PATH:/api/version}
-         NAILGUN_START_MAX_WAIT_TIME={env:NAILGUN_START_MAX_WAIT_TIME:20}
-         TEST_NAILGUN_DB={env:TEST_NAILGUN_DB:nailgun}
+         NAILGUN_PORT=8003
+         NAILGUN_CHECK_PATH=/api/version
+         NAILGUN_START_MAX_WAIT_TIME=20
+
+# NOTE(romcheg): this is a temporary change to work around
+#                a bug in tox 2.2.1
+#                Don't forget to set up all these variables,
+#                manually if you're trying to run tests on
+#                your local environment.
+passenv = FUEL_WEB_ROOT TEST_NAILGUN_DB
+
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands =