cmd/swarm, metrics, swarm/api/client, swarm/storage, swarm/metrics, swarm/api/http: add instrumentation (#18274)

* cmd/swarm: add flag for application name (swarm or swarm-private)

* cmd/swarm/swarm-smoke: return correct exit code

* cmd/swarm/swarm-smoke: remove colorable

* remove swarm/grafana_dashboards

Co-authored-by: NJanos Guljas <janos@resenje.org>
Co-authored-by: NBalint Gabor <balint.g@gmail.com>
Co-authored-by: NAnton Evangelatov <anton.evangelatov@gmail.com>
Co-authored-by: NViktor Trón <viktor.tron@gmail.com>

* swarm: propagate ctx, enable opentracing

* swarm/tracing: log error when tracing is misconfigured

* 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