Remove the SSH key loading applet

Java applets are disappearing on the web; many browsers disable them
by default either by browser vendor choice, operating system developer
choice, or local corporate policy.

Strip this code out so we don't need to maintain it.

Change-Id: Ib28506aedeb684c76d948cf14025e9cb630892ea
Signed-off-by: Shawn O. Pearce <sop@google.com>
6 files changed