Chroot for ossec-logtest

[vikman90]

There is an error when running ossec-logtest to test rules with check_diff, since it doesn't change root directory and tries to create a directory at/queue/diff`.

It's possible to do a workaround and create it at /var/ossec/queue/diff if the binary doens't chroot, but I think the best way is to behave like ossec-analysisd. Also, this way respects the help message:

-D <dir> Directory to chroot into (default: /var/ossec)

At the present, ossec-logtestdoesn't chroot, but only chdir.