hammer2 - More indirect block work & test script work

hammer2 - More indirect block work & test script work

* Correct strategy read and bmap offset calculations to allow for arbitrary
  differences between logical and physical block sizes.  This fixes data
  read-back issues past the first 16K of data.

* Correct a panic related to the use of an unlocked chain in the lookup
  code when indirect blocks have to be recursed through.

* Add vop_getpages/vop_putpages -> stdgetpages/stdputpages.

* Minor reordering for correctness.

* Adjust test scripts to be a bit smarter, adjust debugging kprintf()s