Specify user:pass from stdin rather than on command line

Final Release Note

Description

The current way of specifying username and password, --userpass xxx:yyy is undesirable as the command line is visible under /proc. There are couple of alternatives (at least until [#105] is implemented):

• Allow them to be picked up from stdin, e.g., --userpass - would read it from stdin, allowing a command line like echo $userpass | yottadb -run %ydbgui which ensures that the authentication credentials are visible neither under /proc nor in a shell history.
• Use the mechanism the encryption plugin uses to get the password.

Draft Release Note