[tests] Update peer bootstrap none available integration test

[vpranckaitis]

What this PR does / why we need it:

Updates peer bootstrap none available test to not rely on NoOpAllBootstrapper.

Special notes for your reviewer:

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

NONE

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

NONE

[codecov]

Codecov Report

Merging #3282 (6c488f4) into master (da44ea0) will decrease coverage by 0.0%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #3282     +/-   ##
=========================================
- Coverage    72.4%    72.4%   -0.1%     
=========================================
  Files        1099     1099             
  Lines      101504   101551     +47     
=========================================
+ Hits        73579    73608     +29     
- Misses      22849    22866     +17     
- Partials     5076     5077      +1     

Flag	Coverage Δ
aggregator	76.4% <ø> (-0.1%)	⬇️
cluster	84.8% <ø> (-0.1%)	⬇️
collector	84.3% <ø> (ø)
dbnode	78.9% <ø> (+<0.1%)	⬆️
m3em	74.4% <ø> (ø)
m3ninx	73.5% <ø> (ø)
metrics	19.9% <ø> (ø)
msg	74.0% <ø> (-0.2%)	⬇️
query	67.3% <ø> (-0.1%)	⬇️
x	80.7% <ø> (+0.2%)	⬆️

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[notbdu]

Should we run this with a timeout (e.g. waitUntil(isBootstrapped(), TIMEOUT))?

Feels like this could be flaky.

[vpranckaitis]

StartServer() implicitly waits for bootstrap. These asserts are not really needed, added them just to make it clearer what's being tested.

m3/src/dbnode/integration/setup.go

Lines 757 to 760 in 586ccff

	waitFn := ts.WaitUntilServerIsUp
	if waitForBootstrap {
	waitFn = ts.WaitUntilServerIsBootstrapped
	}

[notbdu]

LGTM