added redis search function, allowing you to search for a key without…

[lojikil]

… loading into redis

Usage:
  ht redis search [flags]

Flags:
  -D, --decode          Decode the base64 before writing to terminal (default no)
  -h, --help            help for search
  -I, --infile string   Infile generated by ht redis dump -j
  -s, --string string   Key value to search for in the redis dump

Global Flags:
  -d, --database int      Redis db. Defaults to 0.
  -H, --host string       Redis hostname. Defaults to locahost (default "localhost")
  -p, --password string   Redis password. Defaults to empty.
  -P, --port int          Redis Port. Defaults to 6379 (default 6379)
  -v, --verbose           Output full results, not newline formatted

And we can use it thusly: ./hunttools redis search -I foo.json -s 'some-key' to see the Base64 dump. This was added so that we can dump raw keys and then load them into something else