Tweak tests so UUIDs aren't reset between web tests

[rowanseymour]

Just trying to keep the diff on the other PR more reasonable. It needs this tweaked so that different test cases can create contacts and get different UUIDs every time

[codecov]

Codecov Report

Merging #314 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #314   +/-   ##
=======================================
  Coverage   53.20%   53.20%           
=======================================
  Files          99       99           
  Lines        8625     8625           
=======================================
  Hits         4589     4589           
  Misses       3345     3345           
  Partials      691      691           

Impacted Files	Coverage Δ
web/testing.go	61.53% <100.00%> (ø)

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