Feature/disable auto discovery

[melowe]

Prevent new peers/parties being added if auto discovery is disabled.

[codecov-io]

Codecov Report

Merging #477 into master will decrease coverage by 0.02%.
The diff coverage is 98.18%.

@@             Coverage Diff              @@
##             master     #477      +/-   ##
============================================
- Coverage      99.7%   99.68%   -0.03%     
- Complexity     1146     1156      +10     
============================================
  Files           182      185       +3     
  Lines          3753     3783      +30     
  Branches        196      198       +2     
============================================
+ Hits           3742     3771      +29     
- Partials         11       12       +1

Impacted Files	Coverage Δ	Complexity Δ
...m/quorum/tessera/config/builder/ConfigBuilder.java	100% <100%> (ø)	38 <0> (ø)	⬇️
.../quorum/tessera/core/config/ConfigServiceImpl.java	100% <100%> (ø)	2 <2> (?)
...a/com/quorum/tessera/config/JaxbConfigFactory.java	100% <100%> (ø)	13 <4> (ø)	⬇️
...m/tessera/node/AutoDiscoveryDisabledException.java	100% <100%> (ø)	1 <1> (?)
...rc/main/java/com/quorum/tessera/config/Config.java	100% <100%> (ø)	11 <3> (+1)	⬆️
...xception/AutoDiscoveryDisabledExceptionMapper.java	100% <100%> (ø)	2 <2> (?)
...uorum/tessera/api/grpc/StreamObserverTemplate.java	100% <100%> (ø)	3 <0> (ø)	⬇️
.../com/quorum/tessera/node/PartyInfoServiceImpl.java	97.77% <92.85%> (-2.23%)	12 <5> (+4)
... and 1 more

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