Sign fetched block

[hewison-chris]

If a block is fetched from another node it is better to make sure our signature is in the block.

[codecov[bot]]

Codecov Report

Merging #3212 (b26003b) into v0.x.x (1ceafbf) will increase coverage by 30.94%. The diff coverage is 91.07%.

@@             Coverage Diff             @@
##           v0.x.x    #3212       +/-   ##
===========================================
+ Coverage   20.14%   51.09%   +30.94%     
===========================================
  Files          64      371      +307     
  Lines        2879    37758    +34879     
===========================================
+ Hits          580    19291    +18711     
- Misses       2299    18467    +16168     

Flag	Coverage Δ
integration	22.65% <19.04%> (+2.50%)	:arrow_up:
unittests	87.35% <91.07%> (?)

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

Impacted Files	Coverage Δ
source/agora/test/Base.d	80.31% <ø> (ø)
source/agora/test/InvalidBlockSigByzantine.d	96.29% <ø> (ø)
source/agora/node/Validator.d	90.45% <85.71%> (ø)
source/agora/consensus/protocol/Nominator.d	91.25% <87.50%> (ø)
source/agora/node/FullNode.d	76.66% <87.50%> (ø)
source/agora/network/Manager.d	79.20% <100.00%> (ø)
source/agora/test/BlockRewards.d	95.23% <100.00%> (ø)
source/agora/test/PeriodicCatchup.d	96.55% <100.00%> (ø)
...dules/ocean/src/ocean/text/convert/Integer_tango.d	49.39% <0.00%> (-10.85%)	:arrow_down:
...ubmodules/ocean/src/ocean/text/convert/Formatter.d	55.27% <0.00%> (-1.01%)	:arrow_down:
... and 320 more

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[hewison-chris]

All green:-)