webrepl_cli.py: Add support for accessing the REPL.
webrepl_cli.py: Add support for accessing the REPL.

With this commit, the webrepl_cli.py script can be used to access the REPL,
for example:

    $ ./webrepl_cli.py -p x 192.168.4.1
    op:repl, host:192.168.20.27, port:8266, passwd:x.
    Remote WebREPL version: (1, 17, 0)
    Use Ctrl-] to exit this shell
    1/2
    0.5
    >>>

Signed-off-by: Damien George <99e6b749acbfbe2a596df99e91d24d6e1fdbee00@micropython.org>

micropython/webrepl,micropython/webrepl,micropython/webrepl