Sets the LHM's session lock wait timeout variables

Problem:

It is possible for the atomic switch to fail when another session has acquired the meta data lock

Solution:

This is part 1 of the solution, here we are forcing the LHM's session variables to be n seconds less than the global,
the next iteration of this will make it so we retry on failure to acquire the lock.
Remove stray logger require
Merge pull request #63 from Shopify/pr_lockwait_to_set

Sets the LHM's session lock wait timeout variables

Conflicts:
	lib/lhm/invoker.rb
:scissors: