Fixes for get_auth_dns

Improve test stability

Add tests for multiple ACL

Update version to 2.30

Fixes problems with SANS separated by spaces and commas (failed tests are DNS problems)

Fix slow fork bomb when directory containing getssl isn't writeable (…).  
_Note failed tests are just due to slow DNS propagation_

Change to use -sigalgs.  Fixes #570

getssl updets itself by:
- checking for a new version
- if so:
  - download the new one into a tmp location
  - rename the current one to name with version appended
  - rename the tmp file to the current location
  - run the new version
If the renaming fails, the old version gets run, which again downloads, etc.
Now exit if the rename (install command) fails.

Support space delimited SANS

Remove manual ACMEv1 -> ACMEv2 upgrade information