Wait up to 30s for block rotation test

[ryanhall07]

It appears like 5s is not long enough to wait. Locally I've seen it
takes 11s.

What this PR does / why we need it:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing and/or backwards incompatible change?:

Does this PR require updating code package or user-facing documentation?:

[codecov]

Codecov Report

Merging #3541 (eda7122) into master (a9dda99) will increase coverage by 0.0%.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #3541   +/-   ##
======================================
  Coverage    55.8%   55.8%           
======================================
  Files         549     549           
  Lines       61437   61437           
======================================
+ Hits        34326   34327    +1     
- Misses      23999   24000    +1     
+ Partials     3112    3110    -2     

Flag	Coverage Δ
aggregator	57.1% <ø> (-0.2%)	⬇️
cluster	∅ <ø> (∅)
collector	54.3% <ø> (ø)
dbnode	60.3% <ø> (+<0.1%)	⬆️
m3em	46.4% <ø> (ø)
metrics	19.8% <ø> (ø)
msg	74.3% <ø> (+0.2%)	⬆️

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