Upgrade Easy-RSA to v3.0.4

Upstream's ChangeLog (without Windows-/Travis related changes) since v3.0.1:

• Remove use of egrep (#154)
• Remove "local" from variable assignment (#165)
• Assign values to variables defined previously w/local
• Finally(?) fix the subjectAltName issues presented earlier (really fixes #168)
• copy CSR extensions into signed certificate