Put tce rootfs zcat before copying out over-rides.

Otherwise we go back to a broken udhcp script.
Merge pull request #545 from SvenDowideit/our-custom-rootfs-overrides-tce-one

Put tce rootfs zcat before copying out over-rides.
ignore iso files
fixed invocation for ntpclient in order to log to /var/lib/boot2docker/log/ntpclient.log properly
shortened min_delay and interval to avoid drifts
Merge pull request #554 from rufiao/master

ntpclient with shorter update and correct logging
bump kernel to 3.16.4
Merge pull request #552 from unclejack/bump_kernel_3.16.3

Bump kernel to 3.16.4