Fix to set more job env vars

This moves a bzero() call checked in with commit 30e45f8a
I also noticed that test1.14 was generating errors like this
"srun: error: cpus_per_node array is not set"
This was due to previously uninitialized variables now being
cleared by bzero (i.e. the old data was garbage, but avoided
the error message). The properly cleared variables were introduced
in commit 0252a63e
bug 1306