swarm: ctx propagation; bmt fixes; pss generic notification framework (#17150)

* cmd/swarm: minor cli flag text adjustments

* swarm/api/http: sticky footer for swarm landing page using flex

* swarm/api/http: sticky footer for error pages and fix for multiple choices

* cmd/swarm, swarm/storage, swarm: fix  mingw on windows test issues

* cmd/swarm: update description of swarm cmd

* swarm: added network ID test

* cmd/swarm: support for smoke tests on the production swarm cluster

* cmd/swarm/swarm-smoke: simplify cluster logic as per suggestion

* swarm: propagate ctx to internal apis (#754)

* swarm/metrics: collect disk measurements

* swarm/bmt: fix io.Writer interface

  * Write now tolerates arbitrary variable buffers
  * added variable buffer tests
  * Write loop and finalise optimisation
  * refactor / rename
  * add tests for empty input

* swarm/pss: (UPDATE) Generic notifications package (#744)

swarm/pss: Generic package for creating pss notification svcs

* swarm: Adding context to more functions

* swarm/api: change colour of landing page in templates

* swarm/api: change landing page to react to enter keypress

swarm/api/http/server_test.go

@@ -18,6 +18,7 @@ package http
 
 import (
 	"bytes"
+	"context"
 	"crypto/rand"
 	"encoding/json"
 	"errors"
@@ -382,15 +383,19 @@ func testBzzGetPath(encrypted bool, t *testing.T) {
 
 	for i, mf := range testmanifest {
 		reader[i] = bytes.NewReader([]byte(mf))
-		var wait func()
-		addr[i], wait, err = srv.FileStore.Store(reader[i], int64(len(mf)), encrypted)
+		var wait func(context.Context) error
+		ctx := context.TODO()
+		addr[i], wait, err = srv.FileStore.Store(ctx, reader[i], int64(len(mf)), encrypted)
 		for j := i + 1; j < len(testmanifest); j++ {
 			testmanifest[j] = strings.Replace(testmanifest[j], fmt.Sprintf("<key%v>", i), addr[i].Hex(), -1)
 		}
 		if err != nil {
 			t.Fatal(err)
 		}
-		wait()
+		err = wait(ctx)
+		if err != nil {
+			t.Fatal(err)
+		}
 	}
 
 	rootRef := addr[2].Hex()