Description of problem:
Traceback from file /tmp/anamon after a manual install via vnc from beaker

Version-Release number of selected component (if applicable):
RHEL6.0-Beta1-4.1_nfs-AP-x86_64 

How reproducible:
Seems it's every time.

Steps to Reproduce:
On the machine web page,
1. choose distro RHEL6.0-Beta1-4.1_nfs-AP-x86_64;
2. type keyword manual in field "KickStart MetaData";
3. append keyword vnc to the string in field "Kernel Options (Install)";
4. keep others as default and provision the system;
5. after the manual install and reboot in vncviewer, we can see the Traceback in console window.
  
Actual results:
Message snips:
Press <enter> for a shell
04:54:54 Starting graphical installation.
disabling swap...
	/dev/dm-0
unmounting filesystems...
	/mnt/runtime done
	disabling /dev/loop0 LOOP_CLR_FD failed: 16
	/proc done
	/dev/pts done
	/sys done
	/mnt/stage2 done
	/selinux done
	/mnt/sysimage/boot done
	/mnt/sysimage/dev/pts done
	/mnt/sysimage/dev/shm done
	/mnt/sysimage/dev done
	/mnt/sysimage/home done
	/mnt/sysimage/proc/bus/usb done
	/mnt/sysimage/proc done
	/mnt/sysimage/sys done
	/mnt/sysimage/test1 done
	/mnt/sysimage/selinux done
Traceback (most recent call last):
  File "/tmp/anamon", line 273, in <module>
    anamon_loop()
  File "/tmp/anamon", line 215, in anamon_loop
    if alog.seen("step installpackages$") or (sysimage.stable() and watch.exists()):
  File "/tmp/anamon", line 154, in stable
    self.update()
  File "/tmp/anamon", line 136, in update
    fd = open('/proc/mounts')
IOError: [Errno 2] No such file or directory: '/proc/mounts'
	/mnt/sysimage done
waiting for mdraid sets to become clean...
sending termination signals...done
sending kill signals...done
rebooting system
Restarting system.


Expected results:
No Traceback

Additional info:
Although there is a traceback, system can boot successfully and run normally.