add INSTANCE_ID to env of bootcmd, add cloud-init-per

the environment varible INSTANCE_ID is set when invoking boothooks from
multi-part input.  However, previously that was not the case for things
run via bootcmd.

This adds cloud-init-per, which makes it easy for user in bootcmd or
boothook to do something per 'instance', 'always', or 'once'.

The functionality in cloud-init-per mostly duplicated what was in
cloud-init-run-module.  That supported "modules", but it is unlikely
that it was used for anything other than "execute".  So, cloud-init-per
now replaces cloud-init-run-module and provides legacy support for
the 'execute' path.

0 files changed, 0 insertions, 0 deletions