Fix CVE-2018-5379, CVE-2018-5380, CVE-2018-5381, CVE-2018-5378
    
    Fixed CVE-2018-5379 - Double free vulnerability in bgpd when processing
      certain forms of UPDATE message allowing to crash or potentially execute
      arbitrary code
    Resolves: rhbz#1546008
    
    Fixed CVE-2018-5380 - bgpd can overrun internal BGP code-to-string
      conversion tables potentially allowing crash
    Resolves: rhbz#1546006
    
    Fixed CVE-2018-5381 - Infinite loop issue triggered by invalid OPEN message
      allows denial-of-service
    Resolves: rhbz#1546004
    
    Fixed CVE-2018-5378 - bgpd does not properly bounds check the data sent with
      a NOTIFY allowing leak of sensitive data or crash
    Resolves: rhbz#1546009