add prometheus integration and fix the logout issue for ldap

[nobodyiam]

#2507 #2633

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@9636d5f). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master    #2638   +/-   ##
=========================================
  Coverage          ?   50.23%           
  Complexity        ?     2061           
=========================================
  Files             ?      413           
  Lines             ?    12647           
  Branches          ?     1294           
=========================================
  Hits              ?     6353           
  Misses            ?     5845           
  Partials          ?      449

Impacted Files	Coverage Δ	Complexity Δ
...lo/portal/spi/configuration/AuthConfiguration.java	5.84% <0%> (ø)	1 <0> (?)

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[coveralls]

Coverage increased (+0.004%) to 53.784% when pulling 34e7833 on nobodyiam:ldap-fix into 9636d5f on ctripcorp:master.