crosstap: new script

crosstap: new script

This script makes it easy to run a systemtap script on a remote target
from a build host.

The script itself contains documentation on basic setup and usage -
see that for details.  In a nutshell, if you have a systemtap script
on the build host, this script allows that systemtap script to be
compiled and run on the target host and for the output appear on the
host terminal.

The crosstap script requires to an sdk build of the target (or a build
with 'tools-profile' added to EXTRA_IMAGE_FEATURES) because it needs
to be able to run the native systemtap built by the systemtap recipe,
which in turn needs access to the kernel built for the target in order
to build the kernel modules that implement the systemtap probe
specified by the systemtap script and which ultimately get shipped to
the target and insmod'ed there.

The crosstap script also needs to be able to ssh to the target host in
order insert the modules on the target, so the target system needs to
support incoming ssh connections.

(From OE-Core rev: c6da6b648328377ba3590fd38cb12dad26a46a13)

Signed-off-by: Tom Zanussi <tom.zanussi@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>