unit-test: Rename 'pkg' parameter of build_and_install()
unit-test: Rename 'pkg' parameter of build_and_install()

A Package class will be introduced shortly. Clarify the intent of the
variable name.

Change-Id: I29df92b4c8f2b7cd6325d9e046b5fbfa26aef1f5
Signed-off-by: Andrew Jeffery <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@aj.id.au>

openbmc/openbmc-build-scripts,openbmc/openbmc-build-scripts