Remove all of the repos which are being automatically mirrored. The
addition of .mbedignore allows these repos to be used directly.
Also pull up on nanostack-hal-mbed-cmsis-rtos.lib to bring in new
features required by the updated repos.
Update the mbed-client repos to bring in the latest changes. With
this PR the mbed-client repos now point to commits mirrored from
the real repo rather than a morpheus fork.