Bugfix/perm storage

A consequence of moving the keychain to permanent storage (#45 for REL-1564) is that keychains from OT testing will get picked up by the new OT and result in confusion and general mayhem. So this PR makes a distinct permstore root for test versions, and renames the keychain file to abandon keychains generated in the current test release.

Worth noting for devs: if your keychain seems to be b0rked just go to the Key Manager and reset it on the Options tab. This will give you a new empty keychain with the distribution's default servers.

@fnussber pls review
What if `core` is kept small (i.e., not including the new target model) and we rename it.  There may be a psychological stigma attached to anything `spModel` which I can understand.