Add inode limit option to #create_container.

* #create_container now takes a hash of arguments, all of which are required.
* Its callers have been updated to use the new argument convention, and set the inode limit to 0 (unlimited) for now.

[#64122944]

Signed-off-by: Michael Maximilien <maxim@us.ibm.com>
Connect inode limits in config to staging and instance container creation.

[#64122944]

Signed-off-by: Michael Maximilien <maxim@us.ibm.com>
Config object provides more robust staging inode defaults.

Signed-off-by: Michael Maximilien <maxim@us.ibm.com>
Config object provides more robust instance inode defaults.

Signed-off-by: Michael Maximilien <maxim@us.ibm.com>
Staging and instance tasks use config helper method for inode limits.

Signed-off-by: Michael Maximilien <maxim@us.ibm.com>