Use procs() when initializing EAGER_CONTEXT

Using `myid()` with `workers()` meant that when the context was initialized with
a single worker the processor list would be: `[OSProc(1), OSProc(1)]`. `procs()`
will always include PID 1 and any other workers, which is what we want.

Author: JamesWrigley

src/sch/eager.jl

@@ -6,7 +6,7 @@ const EAGER_STATE = Ref{Union{ComputeState,Nothing}}(nothing)
 
 function eager_context()
     if EAGER_CONTEXT[] === nothing
-        EAGER_CONTEXT[] = Context([myid(),workers()...])
+        EAGER_CONTEXT[] = Context(procs())
     end
     return EAGER_CONTEXT[]
 end