Adjust long polling timeout

[nobodyiam]

1. adjust server side's long polling timeout from 30 seconds to 60 seconds
2. adjust client side's long polling timeout from 600 seconds to 90 seconds

[codecov-io]

Codecov Report

Merging #1003 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1003      +/-   ##
============================================
- Coverage     48.64%   48.63%   -0.01%     
+ Complexity     1671     1670       -1     
============================================
  Files           364      364              
  Lines         10144    10144              
  Branches       1026     1026              
============================================
- Hits           4935     4934       -1     
  Misses         4847     4847              
- Partials        362      363       +1

Impacted Files	Coverage Δ	Complexity Δ
...o/configservice/wrapper/DeferredResultWrapper.java	100% <ø> (ø)	12 <0> (ø)	⬇️
.../apollo/internals/RemoteConfigLongPollService.java	77.3% <100%> (-0.62%)	27 <0> (-1)

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[coveralls]

Coverage remained the same at 52.218% when pulling bbdf8e5 on nobodyiam:adjust-long-polling-timeout into 92ee12c on ctripcorp:master.