Remove sdk context dep

Signed-off-by: Pavel Korotkov <pavel@nspcc.ru>

global/context.go

@@ -0,0 +1,20 @@
+package global
+
+import (
+	"context"
+	"os/signal"
+	"sync"
+	"syscall"
+)
+
+var (
+	globalContext    context.Context
+	globalContexOnce sync.Once
+)
+
+func Context() context.Context {
+	globalContexOnce.Do(func() {
+		globalContext, _ = signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM, syscall.SIGHUP)
+	})
+	return globalContext
+}