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Add default shortNames to certificates CRD
Defaults to `[cert, certs]` and is configurable with `certificateCRDShortNames` parameter.
**What this PR does / why we need it**:
Simplifies manual certificate management with kubectl.
Fixes#311
<div name="review-notes" />
**Special notes for your reviewer**:
Instead of a boolean switch do/dont include the shortNames, the value defines the aliases. This may be handy if anybody prefers `[crt, crts]` instead.
I'm not too keen on the `certificateCRDShortNames` variable name. It might be better to use `Resource` instead of `CRD` to be consistent with the `createCustomResource` var.
Other CRDs are probably ok without an alias, but other people workflows may differ. Should these also be configurable? In that case, the variables could be `shortNames: {certificates: [], …}`.
**Release note**:
```release-note
Add Certificate CRD shortnames `cert` and `certs`. This is configurable in the Helm Chart with `certificateResourceShortNames`.
```
Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Added Azure DNS support for DNS01 challange
**What this PR does / why we need it**:
Adds another provider (Azure DNS) for DNS01 challange
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#230
**Special notes for your reviewer**:
**Release note**:
```release-note
ACME DNS-01 challenge mechanism for Azure DNS
```
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provider names in issuer.yml and certificate.yml must match
**What this PR does / why we need it**:
Documentation fix. For further information see #209.
**Which issue this PR fixes**
fixes#209
```release-note
NONE
```
