provider/local: don't put tools in cloud-config

While the user-data is not bounded like in ec2
etc., doing this does seem to cause additional
load on cloud-init.

Fixes https://bugs.launchpad.net/juju-core/+bug/1363143
Merge pull request #648 from axw/lp1363143-local-no-tools-in-cloudcfg

provider/local: don't put tools in cloud-config

While the user-data is not bounded like in ec2
etc., doing this does seem to cause additional
load on cloud-init.

Fixes https://bugs.launchpad.net/juju-core/+bug/1363143