Merge remote-tracking branch 'public/sandbox_fixes_rebased_2'

changes/sandbox_fixes_11351

configure.ac

src/common/compat.c

src/common/compat.h

src/common/compat_libevent.c

src/common/compat_libevent.h

src/common/crypto.c

src/common/gen_linux_syscalls.pl

src/common/include.am

src/common/linux_syscalls.inc

src/common/sandbox.c

src/common/sandbox.h

src/common/util.c

src/or/config.c

src/or/dns.c

src/or/main.c

src/or/statefile.c