tests/qtest/migration: Isolate test initialization

We currently have some environment validation to perform and flags to
set during the initialization of the tests. To be able to add more
migration test binaries, we'll need these tasks to be in their own
function so they can be called from more than one place.

Move the initialization code to a function and introduce the
MigrationTestEnv structure to hold the flags that are accessed during
test registration.

Make the env object static to avoid have to change all the code to
pass it around. Similarly with the tmpfs variable, which is used
extensively.

Note: I'm keeping the new functions in migration-test.c because they
are going to be moved in the next patch to the correct place.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>

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