add locks while accessing redolog internal maps

[jshencode]

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.04 :warning:

Comparison is base (0eff36f) 71.21% compared to head (8c58b16) 71.18%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #366      +/-   ##
==========================================
- Coverage   71.21%   71.18%   -0.04%     
==========================================
  Files         178      178              
  Lines       23633    23635       +2     
==========================================
- Hits        16831    16825       -6     
- Misses       5465     5471       +6     
- Partials     1337     1339       +2     

Impacted Files	Coverage Δ
redolog/file_redolog_manager.go	72.16% <100.00%> (+0.26%)	:arrow_up:

... and 2 files with indirect coverage changes

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