Bug 3466: Set SPOOL in query environment instead of LOCAL_DIR

Condor tarball installs generally do:
LOCAL_DIR = /var/lib/condor
SPOOL = $(LOCAL_DIR)/spool

Condor RPM installs generally do:
LOCAL_DIR = /var
SPOOL = $(LOCAL_DIR)/lib/condor/spool

Overriding LOCAL_DIR to get to the secondary schedd doesn't work across both.
Overriding SPOOL to be $(LOCAL_DIR)/spool instead will work for most cases.