install hook error, does not transition to start after resolved

[Kapil Thangavelu]

any resolved action against an install hook error, should automatically transition to the started state (and execute the start hook).

from irc bug report
<kim0> Here are the steps to reproduce:
<kim0> - deploy a formula with an error in its install hook
<kim0> - state becomes, install_error
<kim0> - launch debug-hooks
<kim0> - launch resolved -r <SU>
<kim0> - Broken hook is debugged under tmux
<kim0> - Now "status" mentions state is "installed" not "started"!
<kim0> Now I get the following traceback http://paste.ubuntu.com/620867/
<kim0> and issuing add-relation .. doesn't really help move it from state installed
<kim0> niemeyer: hazmat ^
<kim0> It seems the state-machine is stuck