Adjust redis connection parameters

[devyetii]

Fixes

• Redis is crawling the ports on the servers #1858
• Miner failed to connect to one of the Redis instances leading to that it tries to connect to multiple hosts

Changes

• Fix the connection string to redis_txns

Need to be mentioned in CHANGELOG.md?

Tests

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• blobber:
• gosdk:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[codecov-commenter]

Codecov Report

Merging #1876 (7478382) into staging (34df75f) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           staging    #1876      +/-   ##
===========================================
- Coverage    26.88%   26.86%   -0.02%     
===========================================
  Files          356      356              
  Lines        59195    59193       -2     
===========================================
- Hits         15913    15903      -10     
- Misses       41377    41385       +8     
  Partials      1905     1905              

Flag	Coverage Δ
Unit-Tests	26.86% <0.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
code/go/0chain.net/chaincore/transaction/entity.go	0.00% <0.00%> (-0.73%)	⬇️
...de/go/0chain.net/smartcontract/vestingsc/config.go	52.10% <0.00%> (-3.16%)	⬇️
code/go/0chain.net/chaincore/node/n2n_send.go	31.68% <0.00%> (-0.45%)	⬇️
...ain.net/smartcontract/storagesc/config_settigns.go	54.76% <0.00%> (ø)

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[service-0chain]

Manual system tests [success] with the following config

config	value
tests skipped	TRUE
system-tests	master
gosdk	NOT OVERRIDDEN
zboxcli	staging
zwalletcli	staging
0chain	1858-redis-is-crawling-the-ports-on-the-servers
blobber	staging
authorizer	staging
0box	staging
0block	staging
0dns	staging
explorer	master
0proxy	staging
0search	staging