Default configuration tox env name change

Currently tox configuration has env by name "custom", renaming it
to "default" to generalize for all supported system.

Going forward there will be no system model concept supported from
the test env or from developement skeleton model.

Resolves openbmc/openbmc-test-automation#645

Change-Id: I0b678ffc10e373214bd1dec425182462955acb2c
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/README.md b/README.md
index 8ec7c89..4c0f5a5 100755
--- a/README.md
+++ b/README.md
@@ -74,7 +74,10 @@
 How to test individual test
 ```shell
     One specific test
-    $ tox -e custom -- -t '"DIMM0 no fault"' tests/test_sensors.robot
+    $ tox -e default -- -t '"DIMM0 no fault"' tests/test_sensors.robot
+
+    No preset environment variables, default configuration for all supported systems.
+    $ OPENBMC_HOST=x.x.x.x tox -e default -- tests
 
     No preset environment variables, one test case from one test suite
     $ OPENBMC_HOST=x.x.x.x tox -e barreleye -- -t '"DIMM0 no fault"' tests/test_sensors.robot
diff --git a/tox.ini b/tox.ini
index 8b6aba8..94fedd5 100755
--- a/tox.ini
+++ b/tox.ini
@@ -19,7 +19,7 @@
     cp bin/ssh_pw {envdir}/bin/ssh_pw
 
 
-[testenv:custom]
+[testenv:default]
 deps = {[testenv]deps}
 setenv = {[testenv]setenv}
 commands =