Portage fetch domain needs to access certificates
    
    When source code is available through a secured connection location (HTTPS),
    portage invokes wget in the portage_fetch_t domain, but needs to access the
    certificates on the system to verify the validity of the remotely presented
    certificate.
    
    Signed-off-by: Sven Vermeulen <sven.vermeulen@siphos.be>