"echo -n" with "echon" for portability.
[regress/cipher-speed.sh regress/try-ciphers.sh] test umac-64@openssh.com ok djm@
[regress/cipher-speed.sh regress/forcecommand.sh regress/forwarding.sh] Sync regress tests to -current; include dtucker@'s new cfgmatch and forcecommand tests. Add cipher-speed.sh test (not linked in yet)