cmd/juju/service: fix ppc64 test failure in TestDeployBundleMachinesUnitsPlacement
cmd/juju/service: fix ppc64 test failure in TestDeployBundleMachinesUnitsPlacement

We explicitly pull out the map creation in the call to
s.assertUnitsCreated() in TestDeployBundleMachinesUnitsPlacement and
create the map as a new variable because this appears to tickle a bug on
ppc64le using gccgo-4.9; the bug is that the map on the receiving side
does not have the same contents as it does here - which is weird because
that pattern is used elsewhere in that function.

And just pulling the map instantiation out of the call is not enough; we
need to do something benign with the variable to keep a reference beyond
the call to the s.assertUnitsCreated(). I have to chosen to delete a
non-existent key.

This problem does not occur on amd64 using gc or gccgo-4.9. Nor does it
happen using go1.6 on ppc64. Once we switch to go1.6 across the board
this change should be reverted.

Fixes [LP:#1556116](https://bugs.launchpad.net/juju-core/+bug/1556116)

makyo/juju,frankban/juju,macgreagoir/juju,howbazaar/juju,macgreagoir/juju,macgreagoir/juju,mjs/juju,AdamIsrael/juju,marcmolla/juju,alesstimec/juju,anastasiamac/juju,reedobrien/juju,alesstimec/juju,dimitern/juju,mjs/juju,AdamIsrael/juju,mikemccracken/juju,mikemccracken/juju,AdamIsrael/juju,marcmolla/juju,marcmolla/juju,ericsnowcurrently/juju,dooferlad/juju,howbazaar/juju,bac/juju,frankban/juju,kat-co/juju,gabriel-samfira/juju,howbazaar/juju,axw/juju,frankban/juju,mjs/juju,frankban/juju,gabriel-samfira/juju,bz2/juju,gabriel-samfira/juju,axw/juju,axw/juju,waigani/juju,axw/juju,bz2/juju,reedobrien/juju,perrito666/juju,perrito666/juju,bac/juju,waigani/juju,marcmolla/juju,kat-co/juju,mjs/juju,anastasiamac/juju,anastasiamac/juju,makyo/juju,mjs/juju,alesstimec/juju,bz2/juju,mikemccracken/juju,mikemccracken/juju,perrito666/juju,howbazaar/juju,perrito666/juju,bac/juju,macgreagoir/juju,reedobrien/juju,ericsnowcurrently/juju,waigani/juju,bac/juju,mikemccracken/juju,makyo/juju,axw/juju,anastasiamac/juju,mjs/juju,anastasiamac/juju,dooferlad/juju,alesstimec/juju,marcmolla/juju,AdamIsrael/juju,kat-co/juju,gabriel-samfira/juju,frankban/juju,ericsnowcurrently/juju,kat-co/juju,dooferlad/juju,perrito666/juju,reedobrien/juju,dimitern/juju,gabriel-samfira/juju,waigani/juju,dimitern/juju,mjs/juju,bz2/juju,reedobrien/juju,bogdanteleaga/juju,ericsnowcurrently/juju,dooferlad/juju,macgreagoir/juju,makyo/juju,dooferlad/juju,bac/juju,dimitern/juju,bogdanteleaga/juju,howbazaar/juju,ericsnowcurrently/juju,bz2/juju,alesstimec/juju,kat-co/juju,bogdanteleaga/juju,dimitern/juju,bogdanteleaga/juju