load config file from working directory first

[nobodyiam]

load config file(apollo-env.properties) from working directory first, so that it behaves the same as spring boot config files

[coveralls]

Coverage increased (+0.02%) to 50.07% when pulling 26cc170 on nobodyiam:refine-apollo-env-search into bd1832b on ctripcorp:master.

[codecov-io]

Codecov Report

Merging #607 into master will increase coverage by 0.01%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master     #607      +/-   ##
============================================
+ Coverage     46.51%   46.52%   +0.01%     
- Complexity     1453     1455       +2     
============================================
  Files           339      339              
  Lines          9249     9257       +8     
  Branches        913      914       +1     
============================================
+ Hits           4302     4307       +5     
- Misses         4621     4623       +2     
- Partials        326      327       +1

Impacted Files	Coverage Δ	Complexity Δ
...rip/framework/apollo/core/utils/ResourceUtils.java	54.76% <66.66%> (+1.82%)	5 <4> (+2)	⬆️
...ervice/service/ReleaseMessageServiceWithCache.java	85.71% <0%> (ø)	24% <0%> (ø)	⬇️

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