Automatic merge from submit-queue (batch tested with PRs 44222, 44614, 44292, 44638)

Update dummy certificate used in porter image

**What this PR does / why we need it**: the dummy certificate used for the porter image is incompatible with go1.8+ since it is missing NULL parameters for the RSA public key.

I haven't pushed the new porter image yet.

I verified that this appears to fix the issue. Based on https://github.com/kubernetes/kubernetes/issues/38228#issuecomment-280213590, for the old cert:

```console
$ openssl x509 -in localhost.crt -outform der | openssl asn1parse -inform der -i
...
  105:d=4  hl=2 l=   9 prim:     OBJECT            :rsaEncryption
  116:d=3  hl=2 l=  75 prim:    BIT STRING
...
```

and the new cert:
```console
$ openssl x509 -in localhost.crt -outform der | openssl asn1parse -inform der -i
...
  127:d=4  hl=2 l=   9 prim:     OBJECT            :rsaEncryption
  138:d=4  hl=2 l=   0 prim:     NULL              
  140:d=3  hl=4 l= 271 prim:    BIT STRING        
...
```

**Release note**:

```release-note
NONE
```

cc @liggitt @lavalamp @luxas