When unmounting, the router entry would be tainted, preventing routing.
However, we would then unmount the router before clearing storage, so if
an error occurred the router would have forgotten the path. For auth
mounts this isn't a problem since they had a secondary check, but
regular mounts didn't (not sure why, but this is true back to at least
0.2.0). This meant you could then create a duplicate mount using the
same path which would then not conflict in the router until postUnseal.
This adds the extra check to regular mounts, and also moves the location
of the router unmount.
This also ensures that on the next router.Mount, tainted is set to the
mount entry's tainted status.
Fixes#6769
* Port over some SP v2 bits
Specifically:
* Add too-large handling to Physical (Consul only for now)
* Contextify some identity funcs
* Update SP protos
* Add size limiting to inmem storage
Merge both functions for creating mongodb containers into one.
Add retries to docker container cleanups.
Require $VAULT_ACC be set to enable AWS tests.
