Pass HOME variable to the test environments
Pass HOME variable to the test environments

tox >= 2.0 only passes the PATH variable to the test environment but
the Puppet tests expect the HOME variable to be defined.

Change-Id: I584883ba105d2efc173c48f17eece960d0c16a09

stackforge/fuel-plugin-lma-collector,stackforge/fuel-plugin-lma-collector,stackforge/fuel-plugin-lma-collector,stackforge/fuel-plugin-lma-collector,stackforge/fuel-plugin-lma-collector