Change directories less.

Remove most of the cd commands, referencing the full path to
commands instead. This is mainly done in order to make it easier
to paste various commands fromt he toci_* scripts

Also write out the file $TOCI_WORKING_DIR/toci_env at the end of
a toci run, that can be sourced so it is easier to use toci and
a script to setup a dev environment
Remove heat template circular dependencies patch.