Use correct requirements extras for testing

The [packages] extra is only for Linux and provides support for RPMs
and Windows registry handling. It is needed when doing a develoipment
installation for testing.

Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

Author: pombredanne

configure

@@ -27,7 +27,7 @@ CLI_ARGS=$1
 
 # Requirement arguments passed to pip and used by default or with --dev.
 REQUIREMENTS="--editable . --constraint requirements.txt"
-DEV_REQUIREMENTS="--editable .[dev] --constraint requirements.txt --constraint requirements-dev.txt"
+DEV_REQUIREMENTS="--editable .[dev,packages] --constraint requirements.txt --constraint requirements-dev.txt"
 
 # where we create a virtualenv
 VIRTUALENV_DIR=venv