[CTX] [ALL] identity type

---

Implicitly, A hostSpec like "host" without "user@" part matches only with peer host's identity while "user@host" matches with any kind of identities. By prefixing -iType before hostSpec, identities to be matched can be specified explicitly. for example:

user@host -- matches if at least one of identities is "user@host"
-h/user@host -- matches if peer host's identity is "user@host"
host -- matches if peer host's identity is "host"
-*/host -- matches if at least one of identities is "*@host"
-a/host -- matches if authenticated identity is "*@host"
-a/c/host -- matches if authenticated or certificated identity is "*@host"
-a/* -- matches if authenticated successfully

---