certbot/acme/tests/testdata/rsa4096_cert.pem

Fix TLS-ALPN tests with newer versions of OpenSSL (#8026) Fixes #7988. As described there, the steps involved are: 1. Update our tests so they fail due to this problem. 2. Update the keys used in the tests so they pass with the new changes. For 1, see a [failing travis run](https://travis-ci.com/github/certbot/certbot/jobs/340710511) with the included change. And for the full output to confirm that this is what is failing, see a [run on debian 10](https://github.com/certbot/certbot/files/4692350/debian_run_log.txt). This PR adds `rsa4096_key.pem` and `rsa4096_cert.pem`, updates the `TLS-ALPN` test to use those keys in place of the 1024-bit versions, and fixes the README in that `testdata` folder with correct instructions to generate these files. * export PIP_NO_BINARY in pip install subshell in test_sdists.sh * set environment variable on the line that installs most packages * Generate 4096-bit rsa key and cert, and fix README instructions to do so. * Update TLS_ALPN test to use 4096-bit key instead of 1024-bit key. * Update changelog * Older versions of Python have an error when both VIRTUAL_NO_DOWNLOAD and PIP_NO_BINARY are set, so only apply the latter at the install phase. * Add enum34 constraint manually, since rebuild_dependencies.py seems to be broken. * only delete key if it exists * Check OpenSSL version before trying to set PIP_NO_BINARY * Add comment explaining why we only set PIP_NO_BINARY at the install step 2020-06-01 18:18:38 -04:00			`-----BEGIN CERTIFICATE-----`
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			`-----END CERTIFICATE-----`