Invalidate discovery cache before migration commands
Invalidate discovery cache before migration commands

This change updates the migration commands to invalidate and refetch
the cached discovery information on disk.  This makes it so that the
REST mapper will never use stale discovery data.

Signed-off-by: Monis Khan <19f7b2d00144930eab99c4cfd2a8d2d2a225ef67@redhat.com>

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