Test Lint CRLs

The contents of this directory are a variety of PEM-encoded CRLs uses to test the CRL linting functions in the parent directory.

To create a new test CRL to exercise a new lint:

Install the der2text and text2der tools:

$ go install github.com/syncsynchalt/der2text/cmds/text2der@latest
$ go install github.com/syncsynchalt/der2text/cmds/der2text@latest

Use der2text to create an editable version of CRL you want to start with, usually crl_good.pem:
```
$ der2text crl_good.pem > my_new_crl.txt
```
Edit the text file. See the der2text readme for details about the file format.
Write the new PEM file and run the tests to see if it works! Repeat steps 3 and 4 as necessary until you get the correct result.
```
$ text2der my_new_crl.txt >| my_new_crl.pem
$ go test ..
```
Remove the text file and commit your new CRL.
```
$ rm my_new_crl.txt
$ git add .
```