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Set default cluster resource namespace to current pod namespace
**What this PR does / why we need it**:
Changes the default cluster resource namespace from kube-system to the current namespace of the cert-manager deployment.
**Which issue this PR fixes**: fixes#103
**Release note**:
```release-note
Supporting resources for ClusterIssuer's (e.g. signing CA certificates, or ACME account private keys) will now be stored in the same namespace as cert-manager, instead of kube-system in previous versions. Action required: you will need to ensure to properly manually migrate these referenced resources across into the deployment namespace of cert-manager, else cert-manager may not be able to find account private keys or signing CA certificates.
```
/cc @mikebryant
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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`.
```
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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
```
