vsftpd: relax sandboxing to fix feature regressions

vsftpd confinement was too strict and adjusted to fix some lacking
functionality:
* drop CLONE_NEWPID from clone to enable audit system
* unconditionally enable fcntl with F_SETFL
* this enabled a sendto on /dev/log socket when syslog is enabled

Fixed bugs
bnc#786024
vsftpd broken: audit_log_acct_message() failed: Operation not permitted
bnc#812406
vsftpd dies on attemt to download file
Selected Binaries
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