Fix vault dependency check in bin/testdev
Fix vault dependency check in bin/testdev

The new `vault` plugin interferes with the check for the `vault` binary,
so the path had to be corrected.  Also now accepting any version
matching 0.9.* as a viable vault version.

starkandwayne/shield,starkandwayne/shield,starkandwayne/shield,starkandwayne/shield,starkandwayne/shield