Add config migration utility acceptance test

[chris-j-h]

No description provided.

[codecov-io]

Codecov Report

Merging #630 into master will increase coverage by 0.86%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #630      +/-   ##
============================================
+ Coverage     98.56%   99.42%   +0.86%     
+ Complexity     1865     1863       -2     
============================================
  Files           294      289       -5     
  Lines          5842     5783      -59     
  Branches        275      274       -1     
============================================
- Hits           5758     5750       -8     
+ Misses           56        5      -51     
  Partials         28       28

Impacted Files	Coverage Δ	Complexity Δ
...va/com/quorum/tessera/config/UnixServerSocket.java	100% <100%> (ø)	5 <1> (ø)	⬇️
...rum/tessera/config/util/PasswordReaderFactory.java
...n/java/com/quorum/tessera/data/migration/Main.java
...ain/java/com/quorum/tessera/enclave/rest/Main.java
...rum/tessera/config/util/ConsolePasswordReader.java
...java/com/quorum/tessera/config/migration/Main.java

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