If SSH keys are created without Bouncy Castle, the keys are stored in
a non-standard format. These can be read back in and converted back to
standard OpenSSH format through the use of this tool. This may be used
by anyone trying to support new key types after installing Bouncy
Castle.
Change-Id: I52c00fcd44a55c855b5e3a6ebac1283f860e08b8