mbedtls/tests/data_files/rsa_pkcs1_2048_public.pem

Resolve PR review comments 1) use `pk_get_rsapubkey` instead of reimplementing the parsing 2) rename the key files, according to their type and key size 3) comment in the data_files/Makefile hoe the keys were generated 4) Fix issue of failure parsing pkcs#1 DER format parsing, missed in previous commit 2017-10-16 11:40:27 +02:00			`-----BEGIN RSA PUBLIC KEY-----`
			`MIIBCgKCAQEA2xx/LgvNv87RdRCgorjOfariBeB62ERjj7W9wLAZuTe4GUoO8V10`
			`gGdGhwbeW38GA73BjV4HFdRb9Nzlzz35wREsrmq5ir0dZ2YX6k692xWagofk8HjD`
			`o4WHsP2fqZlf4zPszOoLtWFe8Ul+P6Mt6gEMzEKadpvE0DfTsRcBYQEWWX4cF8NT`
			`/dFyy0xgFdp94uqtUO+O4ovUandV1nDZa7vx7jkEOKO94tHgZmvinEeZ6Sjmtvwu`
			`ymdDhOjVg9admGsBPoHcPHrK+fOc99YoGyd4fMPQ1WOngTSJrSVqvfLq7fpX/OU0`
			`xsEPcS3SCBAbrURB4P55oGOTirFd6bDubwIDAQAB`
			`-----END RSA PUBLIC KEY-----`