Add patch and fix CVE-2017-15132

Add upstream patch to fix CVE-2017-15132, memory leak in the log in process
that can cause memory exhaustion.

PR: 225446
Submitted by: Vladimir Krstulja
Approved by: adamw (maintainer), swills (ports-secteam)
MFH: 2018Q1
Security: 92b8b284-a3a2-41b1-956c-f9cf8b74f500