Use GetEpochFin in auto_back_up.py

[ckyang]

Description

In order to avoid the possible crash when calling auto_back_up.py without Zilliqa process running, change GetCurrentMiniEpoch to GetEpochFin.

Backward Compatibility

• This is not a breaking change
• This is a breaking change

Review Suggestion

Status

Implementation

• ready for review

Integration Test (Core Team)

• local machine test

• small-scale cloud test

[codecov-io]

Codecov Report

Merging #1774 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #1774      +/-   ##
=========================================
+ Coverage    33.5%   33.5%   +<.01%     
=========================================
  Files         270     270              
  Lines       33277   33277              
=========================================
+ Hits        11148   11151       +3     
+ Misses      22129   22126       -3

Impacted Files	Coverage Δ
src/libUtils/SWInfo.cpp	93.12% <0%> (+2.29%)	⬆️

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