*: add http api for adapt kubernetes

[zhyass]

[summary] By using api can fix the kubernetes container memory increase unexpected bug.

https://github.com/zhyass/mysql-operator/issues/17

Before: https://github.com/zhyass/mysql-operator/blob/master/cluster/syncer/status.go#L270

memory: 230+ M

After:

https://github.com/zhyass/radondb-mysql-kubernetes/blob/meg/cluster/syncer/status.go#L281

memory: 17M

[codecov[bot]]

Codecov Report

Merging #139 (d317153) into feature_adapt_k8s (88c1a8a) will increase coverage by 0%. The diff coverage is 100%.

@@               Coverage Diff                @@
##           feature_adapt_k8s   #139   +/-   ##
================================================
  Coverage                 68%    68%           
================================================
  Files                     48     48           
  Lines                   3744   3749    +5     
================================================
+ Hits                    2558   2563    +5     
  Misses                   954    954           
  Partials                 232    232           

Impacted Files	Coverage Δ
src/config/config.go	80% <100%> (+<1%)	:arrow_up:
src/server/server.go	52% <100%> (+1%)	:arrow_up:

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[hustjieke]

radondb:feature_adapt_k8s should merge commits with main feature first.

[zhyass]

radondb:feature_adapt_k8s should merge commits with main feature first.

The main feature has been merged.

[hustjieke]

LGTM.

[dbkernel]

Advice:

1. Add security authentication
2. Add configuration items to set whether or not the RESTful API is enabled

[zhyass]

Advice:

1. Add security authentication

2. Add configuration items to set whether or not the RESTful API is enabled

Done.

[dbkernel]

LGTM

[andyli029]

LGTM.