* pip tests: remove trailing spaces
* pip tests: use Jinja tests
* fixup! pip tests: remove trailing spaces
* pip tests: use 'command' instead of 'shell' module
* pip tests: remove unused variable
* pip tests: use a package with fewer dependencies
sampleproject has one dependency: 'peppercorn' and peppercorn doesn't
have any dependency.
* pip tests: check that 'name' param handles list
* pip: squash package parameters
Note that squashing will be removed in 2.11, new code should directly
use a list with the 'name' parameter.
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