Add DDB support for printing vnet_sysinit and vnet_sysuninit ordered call lists. Try to lookup function/symbol names and print those in addition to the pointers, along with the constants for subsystem and order. This is useful for debugging vnet teardown ordering issues.
Add DDB support for printing vnet_sysinit and vnet_sysuninit
ordered call lists. Try to lookup function/symbol names and print
those in addition to the pointers, along with the constants for
subsystem and order.
This is useful for debugging vnet teardown ordering issues.

Make it possible to call the actual printing frunction from normal
code at runtime, ie. from vnet_sysuninit(), if DDB support is there.

Sponsored by:	ISPsystem
MFC After:	8 days

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