[WIP] add and use tracing API as part of package logging

- make `logging.GetLogger(ctx, Subsys)` the authoritative `logger.Logger` factory function
    - the context carries a linked list of injected fields which
      `logging.GetLogger` adds to the logger it returns
- introduce the concept of tasks and spans, also tracked as linked list within ctx
    - [ ] TODO automatic logging of span begins and ends, with a unique
      ID stack that makes it easy to follow a series of log entries in
      concurrent code
    - ability to produce a chrome://tracing-compatible trace file,
      either via an env variable or a `zrepl pprof` subcommand
        - this is not a CPU profile, we already have go pprof for that
        - but it is very useful to visually inspect where the
          replication / snapshotter / pruner spends its time
          ( fixes #307 )

client/zfsabstractions_list.go

@@ -32,9 +32,8 @@ var zabsCmdList = &cli.Subcommand{
 	},
 }
 
-func doZabsList(sc *cli.Subcommand, args []string) error {
+func doZabsList(ctx context.Context, sc *cli.Subcommand, args []string) error {
 	var err error
-	ctx := context.Background()
 
 	if len(args) > 0 {
 		return errors.New("this subcommand takes no positional arguments")