Use 4096 bit key length for test certs

Fixes a security error on debian machines

contrib/generate_cert.sh

@@ -3,7 +3,7 @@
 # When prompted for multiple lines of information, leave everything blank instead of "common name"
 # This should be your domain name. E.g. "localhost" if you are testing on your local machine
 
-openssl genrsa -des3 -out server.key 1024
+openssl genrsa -des3 -out server.key 4096
 openssl req -new -key server.key -out server.csr
-openssl x509 -req -days 1024 -in server.csr -signkey server.key -out server.crt
+openssl x509 -req -days 4096 -in server.csr -signkey server.key -out server.crt
 openssl pkcs12 -export -out identity.pfx -inkey server.key -in server.crt