avoid calling start_task too many times on multi-install-new-maas. don't die and add debug info
make task name for write_juju_env match the registered task name
run apt-go-fast on all machines, not just N times on the controller machine for single only
avoid registering tasks twice and having two task lists. pass a list of post-tasks into MultiInstall classes from LandscapeInstall
Merge pull request #184 from Ubuntu-Solutions-Engineering/fix-apt-go-fast

run apt-go-fast on all machines
minor fix of setting display_controller

Signed-off-by: Adam Stokes <adam.stokes@ubuntu.com>
Merge pull request #185 from Ubuntu-Solutions-Engineering/refactor-landscape-progress

avoid registering tasks twice and having two task lists.