Description of problem:
After start virt-who with command-line in the terminal, it will display "inactive" in the systemctl. 

Version-Release number of selected component (if applicable):
virt-who-0.8-8.el7.noarch
python-rhsm-1.10.6-1.el7.x86_64
subscription-manager-1.10.6-1.el7.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Start virt-who with command-line in the ternimal
[root@dhcp-65-83 /]# virt-who --esx --esx-owner=ACME_Corporation --esx-env=Library --esx-server=10.66.79.63 --esx-username=Administrator --esx-password=qwer1234P! -b -d

2. Check the log in the /var/log/rhsm/rhsm.log, virt-who has been started.
2013-11-28 11:06:39,776 [WARNING]  @virt-who.py:462 - Listening for events is not available in VDSM, ESX, RHEV-M or Hyper-V mode
2013-11-28 11:06:44,959 [DEBUG]  @virt-who.py:475 - Virt-who is running in esx mode
2013-11-28 11:06:44,960 [DEBUG]  @virt-who.py:482 - Starting infinite loop with 3600 seconds interval and event handling
2013-11-28 11:06:45,791 [DEBUG]  @subscriptionmanager.py:89 - Sending update in hosts-to-guests mapping: {44454c4c-4c00-1031-8053-b8c04f4e3258: [42264b6e-e140-4354-a8e8-9efff7b99e06], 44454c4c-4200-1034-8039-b8c04f503258: [564db05b-769f-69ac-642a-8b7916f7be7a, 42268a03-b68f-52e6-805f-9126c3b006dd, 4226082e-2746-17dc-6f01-dc91c6fc7fbb, 4226a1bf-d361-fd50-9d0c-50b5b56c982a]}

3. Check the virt-who status in the systemctl
[root@dhcp-65-83 run]# systemctl status virt-who
virt-who.service - Daemon for reporting virtual guest IDs to subscription-manager
   Loaded: loaded (/usr/lib/systemd/system/virt-who.service; disabled)
   Active: inactive (dead)
Nov 28 11:06:04 dhcp-65-83.nay.redhat.com systemd[1]: Starting Daemon for reporting virtual guest IDs to subscription-manager...
Nov 28 11:06:04 dhcp-65-83.nay.redhat.com systemd[1]: PID 7722 read from file /var/run/virt-who.pid does not exist.
Nov 28 11:06:04 dhcp-65-83.nay.redhat.com python[7728]: Listening for events is not available in VDSM, ESX, RHEV-M or Hyper-V mode
Nov 28 11:06:04 dhcp-65-83.nay.redhat.com systemd[1]: Started Daemon for reporting virtual guest IDs to subscription-manager.
Nov 28 11:06:09 dhcp-65-83.nay.redhat.com python[7728]: Virt-who is running in esx mode
Nov 28 11:06:09 dhcp-65-83.nay.redhat.com python[7728]: Starting infinite loop with 10 seconds interval and event handling
Nov 28 11:06:10 dhcp-65-83.nay.redhat.com python[7728]: Sending update in hosts-to-guests mapping: {44454c4c-4c00-1031-8053-b8c04f4e3258:...
Nov 28 11:06:22 dhcp-65-83.nay.redhat.com systemd[1]: Stopping Daemon for reporting virtual guest IDs to subscription-manager...
Nov 28 11:06:22 dhcp-65-83.nay.redhat.com systemd[1]: Stopped Daemon for reporting virtual guest IDs to subscription-manager.
Hint: Some lines were ellipsized, use -l to show in full.

4. Check the virt-who process
[root@dhcp-65-83 /]# ps -ef|grep virt-who
root      1476     1 37 18:06 ?        00:00:05 /usr/bin/python /usr/share/virt-who/virt-who.py --esx --esx-owner=ACME_Corporation --esx-env=Library --esx-server=10.66.79.63 --esx-username=Administrator --esx-password=qwer1234P! -b -d
root      1489 10632  0 18:06 pts/1    00:00:00 grep --color=auto virt-who

5. Kill the virt-who process and restart the virt-who with systemctl
[root@dhcp-65-83 /]# kill -9 1476
[root@dhcp-65-83 /]# ps -ef|grep virt-who
root      1492 10632  0 18:06 pts/1    00:00:00 grep --color=auto virt-who
[root@dhcp-65-83 run]# systemctl start virt-who
Job for virt-who.service failed. See 'systemctl status virt-who.service' and 'journalctl -xn' for details.
[root@dhcp-65-83 run]# systemctl status virt-who
virt-who.service - Daemon for reporting virtual guest IDs to subscription-manager
   Loaded: loaded (/usr/lib/systemd/system/virt-who.service; disabled)
   Active: failed (Result: exit-code) since Thu 2013-11-28 14:27:21 CST; 6s ago
  Process: 8920 ExecStart=/usr/bin/virt-who (code=exited, status=1/FAILURE)
Nov 28 14:27:21 dhcp-65-83.nay.redhat.com systemd[1]: Starting Daemon for reporting virtual guest IDs to subscription-manager...
Nov 28 14:27:21 dhcp-65-83.nay.redhat.com virt-who[8920]: virt-who seems to be already running. If not, remove /var/run/virt-who.pid
Nov 28 14:27:21 dhcp-65-83.nay.redhat.com systemd[1]: virt-who.service: control process exited, code=exited status=1
Nov 28 14:27:21 dhcp-65-83.nay.redhat.com systemd[1]: Failed to start Daemon for reporting virtual guest IDs to subscription-manager.
Nov 28 14:27:21 dhcp-65-83.nay.redhat.com systemd[1]: Unit virt-who.service entered failed state.

Actual results:
After step2: Although virt-who has been started, its status still display "inactive (dead)" in the systemctl
After step5: Although virt-who hasn't been started, it still can't be started by systemctl.

Expected results:
Once virt-who has been started or stopped, systemctrl can monitor it's status.

Additional info: