Fixes to 0.7 release

[melowe]

Issues address from 0.7 release

1. Peer discovery bug. Peers need to discover each other even if not listed in initial peers list
2. Update surefire plugin (cherry picked from master)
3. Trim key values to mirror behaviour in other transaction managers (cherry picked from master)
4. Add file contents validation to ensure that key files have contents, ensuring that node won't be started.
5. Empty key value validation. Fixed problem where empty key values were't being validated
6. Randomise acceptance test node startup order
7. Add acceptance test scenarios proving that key validation changes in fact work and suppress startup.
8. Fix for Unauthenticated Denial of Service vulnerability
9. Fix unit test in AzureVaultKeyGeneratorTest

[codecov-io]

Codecov Report

Merging #526 into patch-release-0.7.1 will increase coverage by 0.53%.
The diff coverage is 100%.

@@                    Coverage Diff                    @@
##             patch-release-0.7.1     #526      +/-   ##
=========================================================
+ Coverage                  98.88%   99.42%   +0.53%     
- Complexity                  1236     1257      +21     
=========================================================
  Files                        213      211       -2     
  Lines                       3961     3975      +14     
  Branches                     211      212       +1     
=========================================================
+ Hits                        3917     3952      +35     
+ Misses                        26        5      -21     
  Partials                      18       18

Impacted Files	Coverage Δ	Complexity Δ
.../quorum/tessera/config/keypairs/DirectKeyPair.java	100% <ø> (ø)	5 <0> (ø)	⬇️
...rum/tessera/config/keypairs/FilesystemKeyPair.java	100% <ø> (ø)	12 <0> (ø)	⬇️
.../quorum/tessera/config/keypairs/InlineKeypair.java	100% <ø> (ø)	7 <0> (ø)	⬇️
...sera/api/exception/KeyNotFoundExceptionMapper.java	100% <100%> (ø)	3 <1> (ø)	⬇️
.../quorum/tessera/node/PartyInfoParserException.java	100% <100%> (ø)	1 <1> (?)
...sera/config/constraints/ValidContentValidator.java	100% <100%> (ø)	9 <9> (?)
.../java/com/quorum/tessera/node/PartyInfoParser.java	100% <100%> (ø)	20 <14> (+12)	⬆️
...in/java/com/quorum/tessera/api/ConfigResource.java	100% <100%> (ø)	5 <1> (ø)	⬇️
...orum/tessera/config/keypairs/KeyPairConverter.java	100% <100%> (ø)	4 <0> (ø)	⬇️
...main/java/com/quorum/tessera/node/model/Party.java	100% <100%> (ø)	7 <1> (+1)	⬆️
... and 7 more

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