file descriptor for the pid file is leaking

[SharkCZ]

I got a report from a user whop has SELinux enabled that SELinux is preventing /bin/hostname access to a leaked /var/run/zabbix/zabbix_agentd.pid file descriptor. The solution is to add "fcntl(fd, F_SETFD, FD_CLOEXEC)" to function create_pid_file() in src/libs/zbxnix/pid.c. A patch will follow.

Seel also https://bugzilla.redhat.com/show_bug.cgi?id=559221

[SharkCZ]

So not only file descriptors are leaking, but also sockets. Patches for 1.8 and 1.6 are attached.