fix some bugs

[LanternLee]

1. fix metaserver long FGC caused by too many soft Ref
2. skip markDown on site unstable
3. avoid misMarkDown call from wrong activeDc
4. remove old jar log every start
5. report dest Redis as unhealthy instance in unhealthy bi_direction repl

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 53.79%. Comparing base (b903aab) to head (2048997).
Report is 2 commits behind head on master.

Files	Patch %	Lines
...com/ctrip/xpipe/endpoint/ClusterShardHostPort.java	38.88%	7 Missing and 4 partials ⚠️
...e/service/impl/DefaultCrossMasterDelayService.java	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #775      +/-   ##
============================================
+ Coverage     53.62%   53.79%   +0.16%     
- Complexity    10286    10377      +91     
============================================
  Files          1787     1789       +2     
  Lines         55736    56022     +286     
  Branches       5813     5859      +46     
============================================
+ Hits          29890    30137     +247     
- Misses        23305    23322      +17     
- Partials       2541     2563      +22     

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