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