Remove NOMODDB flag flag from context init, look for full tokens
    
    The NSS databases were almost universally initialized with the
    NOMODDB flag. I'm not sure if something changed in NSS but the
    PKCS#11 modules were not being initialized. Adding this back after
    permission checks are done results in tokens working again.
    
    When looking for certs and keys try the full token:nickname string
    as well as just nickname when comparing values.
    
    https://pagure.io/certmonger/issue/125