Description of problem:
It is not possible to add an option to /etc/crypttab so it does not query the passphrase for a crypted device. This makes it impossible to have an unattended boot, even if that particular partition is not necessary for booting.

Version-Release number of selected component (if applicable):
initscripts-8.95-1.x86_64

How reproducible:
on every boot.

Steps to Reproduce:
1. create an encrypted /home partition
2. add corresponding entry to /etc/crypttab
3. reboot

When nobody is in front of the machine, it gets to the crypted filesystem passphrase promt, without any possibility of logging in remotely to enable the decryption of the encrypted partition.

Adding a timeout option in /etc/crypttab and accordingly some parsing in /etc/rc.d/rc.sysinit would allow the machine to wait some time and proceed without mounting the specified partitions, which would be unavailable until someone mounts them manually. This manual mount could be done remotely.

Additional info:
This is a similar request as in Bug 434696. The request of an noauto option would allow the system to be booted, but a timeout would be more flexible in this case.