Add arguments for managing tls ciphers & netmon

This adds 2 arguments:
    /tls-ciphers                List of permitted openssl ciphers - see ciphers(1)
    /tls-ciphers-netmon         Use tls ciphers that netmon can parse

With KB2919355, client/server negotiate the use of
TLS cipher TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
which works fine except that netmon can't parse it.
By adding commandline /tls-ciphers-netmon, we restrict
the available ciphers to a list that netmon can
deal with.  Also adds /tls-ciphers, which
accepts a string arg, for further customization.
Merge pull request #1970 from dbungert/cipher

Add arguments for managing tls ciphers & netmon