generalize log capture to all admin commands; simplify handler

Signed-off-by: Jason Volk <jason@zemos.net>

src/admin/command.rs

@@ -1,6 +1,9 @@
-use service::Services;
+use std::time::SystemTime;
+
+use conduit_service::Services;
 
 pub(crate) struct Command<'a> {
 	pub(crate) services: &'a Services,
 	pub(crate) body: &'a [&'a str],
+	pub(crate) timer: SystemTime,
 }