Add ensureState helper for checking container state

We have a lot of checks for container state scattered throughout
libpod. Many of these need to ensure the container is in one of a
given set of states so an operation may safely proceed.
Previously there was no set way of doing this, so we'd use unique
boolean logic for each one. Introduce a helper to standardize
state checks.

Note that this is only intended to replace checks for multiple
states. A simple check for one state (ContainerStateRunning, for
example) should remain a straight equality, and not use this new
helper.

Signed-off-by: Matthew Heon <mheon@redhat.com>

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