Resolves the following warning:
In caucase.sh line 293:
pem2fingerprint () {
^-- SC2120 (warning): pem2fingerprint references arguments, but none are ever passed.

In caucase.sh line 300:
  test "$1" = "$(pem2fingerprint)" && return 1
                 ^-------------^ SC2119 (info): Use pem2fingerprint "$@" if function's $1 should mean script's $1.

In caucase.sh line 391:
    | pem2fingerprint)" && return
      ^-------------^ SC2119 (info): Use pem2fingerprint "$@" if function's $1 should mean script's $1.

For more information:
  https://www.shellcheck.net/wiki/SC2120 -- pem2fingerprint references argume...
  https://www.shellcheck.net/wiki/SC2119 -- Use pem2fingerprint "$@" if funct...