Set local ID for messages in memory impl

[pav-kv]

No description provided.

[codecov]

Codecov Report

Merging #1410 into master will increase coverage by 0.15%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #1410      +/-   ##
=========================================
+ Coverage   66.35%   66.5%   +0.15%     
=========================================
  Files          53      53              
  Lines        3980    3986       +6     
=========================================
+ Hits         2641    2651      +10     
+ Misses        951     948       -3     
+ Partials      388     387       -1

Impacted Files	Coverage Δ
impl/memory/mutation_logs.go	81.81% <100%> (+2.22%)	⬆️
core/integration/client_tests.go	85.24% <0%> (ø)	⬆️
core/sequencer/server.go	75.24% <0%> (+0.32%)	⬆️
core/sequencer/trillian_client.go	62.85% <0%> (+1.42%)	⬆️
impl/sql/directory/storage.go	69.17% <0%> (+1.5%)	⬆️

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[pav-kv]

I wonder if we should have some tests exercising uniqueness of (ID, LocalID).

[gdbelvin]

Please add a test to core/integration/storagetest that verifies the existence of these new fields

[pav-kv]

Added some test coverage.