Refactor admin commands to use structopt

Cargo.toml

@@ -83,6 +83,9 @@ thread_local = "1.1.3"
 # used for TURN server authentication
 hmac = "0.11.0"
 sha-1 = "0.9.8"
+# used for conduit's CLI and admin room command parsing
+structopt = { version = "0.3.25", default-features = false }
+pulldown-cmark = "0.9.1"
 
 [features]
 default = ["conduit_bin", "backend_sqlite", "backend_rocksdb"]