Network unit tests: Advance clock during the test

[hewison-chris]

Fixes issue #3298 .

[codecov[bot]]

Codecov Report

Merging #3299 (c19f685) into v0.x.x (ef399df) will increase coverage by 0.27%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           v0.x.x    #3299      +/-   ##
==========================================
+ Coverage   88.79%   89.07%   +0.27%     
==========================================
  Files         165      165              
  Lines       17063    17069       +6     
==========================================
+ Hits        15151    15204      +53     
+ Misses       1912     1865      -47     

Flag	Coverage Δ
integration	47.71% <ø> (+7.83%)	:arrow_up:
unittests	87.83% <100.00%> (-0.03%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
source/agora/test/Base.d	80.70% <100.00%> (+0.22%)	:arrow_up:
source/agora/node/Validator.d	91.95% <0.00%> (-1.01%)	:arrow_down:
source/agora/consensus/state/Ledger.d	90.06% <0.00%> (-0.67%)	:arrow_down:
source/agora/flash/Node.d	80.67% <0.00%> (-0.43%)	:arrow_down:
source/agora/node/FullNode.d	76.47% <0.00%> (+0.30%)	:arrow_up:
source/agora/consensus/protocol/Nominator.d	91.45% <0.00%> (+0.53%)	:arrow_up:
source/agora/network/Manager.d	77.84% <0.00%> (+0.63%)	:arrow_up:
source/agora/node/Registry.d	79.37% <0.00%> (+2.08%)	:arrow_up:
source/agora/node/Config.d	76.64% <0.00%> (+8.02%)	:arrow_up:
source/agora/node/Runner.d	55.55% <0.00%> (+15.03%)	:arrow_up:
... and 1 more

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[hewison-chris]

It didn't catch the AssertError. Will update.

[hewison-chris]

Updated to catch Throwable which will catch AssertError.