Workaround an egg issue with kiwi.environ

kiwi.environ is checking if the first argument (ie, the currently running
app), is a egg to determine if every other library is also an egg, but this
is a wrong assumption, since kiwi may be installed normally, but only the
current running app is inside the egg.

Change-Id: Ia8809bc4d8af2cc05aea7bd4147d7af54def51ee