Enable upgrade property chunking, like master

[matham]

Fixes #511 by enabling chunks.

[codecov-commenter]

Codecov Report

Merging #513 (56685c2) into master (60154df) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #513   +/-   ##
=======================================
  Coverage   78.77%   78.77%           
=======================================
  Files          59       59           
  Lines        9386     9386           
=======================================
  Hits         7394     7394           
  Misses       1992     1992           

Impacted Files	Coverage Δ
nixio/cmd/upgrade.py	8.46% <0.00%> (ø)

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[coveralls]

Coverage remained the same at 79.04% when pulling 56685c2 on matham:patch-2 into 60154df on G-Node:master.