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/bin/systemctl status  slapd.service
slapd.service - OpenLDAP Server Daemon
	  Loaded: loaded (/usr/lib/systemd/system/slapd.service; disabled)
	  Active: inactive (dead)


systemctl status  portreserve.service
portreserve.service - Port reservation utility
	  Loaded: loaded (/usr/lib/systemd/system/portreserve.service; disabled)
	  Active: active (running) since Thu 2013-02-21 06:51:46 EST; 6s ago
	 Process: 11448 ExecStart=/sbin/portreserve (code=exited, status=0/SUCCESS)
	Main PID: 11449 (portreserve)
	  CGroup: name=systemd:/system/portreserve.service
		  └─11449 /sbin/portreserve


::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: [   LOG    ] :: Test
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

:: [   FAIL   ] :: Running 'netstat -anp | grep 636 | grep portreserve' (Expected 0, got 1)
:: [   LOG    ] :: Duration: 0s
:: [   LOG    ] :: Assertions: 0 good, 1 bad
:: [   FAIL   ] :: RESULT: Test

package versions:

openldap-2.4.33-3.el7
portreserve-0.0.5-6.el7

systemd socket activation should cover this, correct?

If a service is activated by a socket, systemd creates that socket much sooner than any other service can claim it.