Update go micro v3

[butonic]

• etcd registry requires replacing:

  // taken from https://github.com/asim/go-micro/blob/master/plugins/registry/etcd/go.mod#L14-L16
  go.etcd.io/etcd/api/v3 => go.etcd.io/etcd/api/v3 v3.0.0-20210204162551-dae29bb719dd
  go.etcd.io/etcd/pkg/v3 => go.etcd.io/etcd/pkg/v3 v3.0.0-20210204162551-dae29bb719dd
  

• micro/cli/v2 cannot be replaced with urfave/cli because the micro v3 interfaces use micro/cli/v2 for flags
• removed ocis-pkg http server option.Hander -> use micro.RegisterHandler(service.Service, handler) instead to resemble the grpc server
• upstream pr Support for tls on the server http plugin micro/go-micro#2126
• tons of protobuf warnings:

  2021/02/17 16:52:07 WARNING: proto: extension number 1042 is already registered on message google.protobuf.MethodOptions
  A future release will panic on registration conflicts. See:
  https://developers.google.com/protocol-buffers/docs/reference/go/faq#namespace-conflict
  

  maybe regenerate all protobuf? or use another version of google.golang.org/grpc v1.29.1
• check if we can use micros prometheus wrapper instead of the one in ocis-pkg, use it for http & grpc

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[butonic]

@C0rby maybe the domain is not set up correctly ?

5804 | 16) Scenario: closing media viewer is possible (attempt 1, retried) # tests/acceptance/features/webUIPreview/imageMediaViewer.feature:65
5805 | ✔ Before # tests/acceptance/setup.js:28
5806 | ✔ Before # tests/acceptance/setup.js:32
5807 | ✔ Before # tests/acceptance/setup.js:36
5808 | ✔ Before # tests/acceptance/setup.js:46
5809 | ✔ Before # tests/acceptance/setup.js:68
5810 | ✔ Before # tests/acceptance/setup.js:75
5811 | ✔ Before # tests/acceptance/stepDefinitions/filesContext.js:16
5812 | ✔ Before # tests/acceptance/stepDefinitions/generalContext.js:248
5813 | ✔ Before # tests/acceptance/stepDefinitions/generalContext.js:287
5814 | ✔ Given user "user1" has been created with default attributes # tests/acceptance/stepDefinitions/provisioningContext.js:157
5815 | ✔ Given user "user1" has uploaded file "testavatar.jpg" to "testavatar.jpg" # tests/acceptance/stepDefinitions/filesContext.js:98
5816 | ✔ And user "user1" has logged in using the webUI # tests/acceptance/stepDefinitions/loginContext.js:67
5817 | ✖ And the user has viewed the file "testavatar.jpg" in the media viewer using the webUI # tests/acceptance/stepDefinitions/previewContext.js:7
5818 | Timed out while waiting for element <//div[contains(@class,"uk-position-bottom-center")]/div[contains(text(),"testavatar.jpg")]> to be present for 20000 milliseconds. - expected "visible" but got: "not found" (20023ms)
5819 | at Proxy.waitForMediaViewerLoaded (/srv/app/web/tests/acceptance/pageObjects/FilesPageElement/mediaViewerPage.js:17:10)
5820 | at _callee$ (/srv/app/web/tests/acceptance/stepDefinitions/previewContext.js:11:26)
5821 | at runMicrotasks (<anonymous>)
5822 | at processTicksAndRejections (internal/process/task_queues.js:97:5)
5823 | - When the user closes the media resource using the webUI # tests/acceptance/stepDefinitions/previewContext.js:28
5824 | - Then the file "testavatar.jpg" should not be displayed in the media viewer webUI # tests/acceptance/stepDefinitions/previewContext.js:40
5825 | - And the user should be in the root directory on the webUI # tests/acceptance/stepDefinitions/filesContext.js:1246
5826 | ✔ After # tests/acceptance/stepDefinitions/provisioningContext.js:239
5827 | ✔ After # tests/acceptance/stepDefinitions/generalContext.js:299
5828 | ✔ After # tests/acceptance/stepDefinitions/generalContext.js:272
5829 | ✔ After # tests/acceptance/setup.js:110
5830 | ✔ After # tests/acceptance/setup.js:106
5831 | ✔ After # tests/acceptance/setup.js:102
5832 | ✔ After # tests/acceptance/setup.js:95
5833 | ✔ After # tests/acceptance/setup.js:86
5834 | ✔ After # tests/acceptance/setup.js:54
5835

[butonic]

@C0rby locally I can reproduce the thumbnails not working when using the owncloud driver and setting the THUMBNAILS_WEBDAVSOURCE_BASEURL="https://cloud.ocis.test/remote.php/webdav/" which is my url ...
89b06de should fix it

[sonarqubecloud]

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