src,deps,build,test: add OpenSSL config appname
This commit adds the setting of an appname (configuration section
name), nodejs_conf, to be used when reading OpenSSL configuration
files.
The motivation for this is that currently the default OpenSSL
configuration, openssl_conf, element will be used which may be
undesirable as it might configure OpenSSL in unwanted ways. With this
commit it is still possible to use a default openssl.cnf file but the
only section that Node.js will read from is a section named
nodejs_conf.