Changes: rename 'tenant' to 'domain' and add 'project' key.

[little-cui]

(cherry picked from commit 111cb80)

[coveralls]

Coverage increased (+0.1%) to 70.047% when pulling c2b567b on little-cui:master into b7710a3 on ServiceComb:master.

[codecov-io]

Codecov Report

Merging #160 into master will increase coverage by 0.26%.
The diff coverage is 85.02%.

@@            Coverage Diff             @@
##           master     #160      +/-   ##
==========================================
+ Coverage   65.58%   65.85%   +0.26%     
==========================================
  Files          18       18              
  Lines        4423     4449      +26     
==========================================
+ Hits         2901     2930      +29     
+ Misses       1335     1334       -1     
+ Partials      187      185       -2

Impacted Files	Coverage Δ
server/service/tag.go	71.01% <100%> (ø)	⬆️
server/service/util/tag_util.go	63.63% <100%> (ø)	⬆️
server/service/governservice.go	71.84% <100%> (+3.24%)	⬆️
server/service/rule.go	71.51% <100%> (ø)	⬆️
server/service/microservices.go	72.21% <100%> (-0.09%)	⬇️
server/service/util/dependency.go	47.93% <58.97%> (ø)	⬆️
server/service/util/heartbeat_util.go	33.33% <66.66%> (ø)	⬆️
server/service/util/domain_util.go	76.71% <72.09%> (ø)
server/service/util/microservice_util.go	69.49% <83.33%> (ø)	⬆️
server/service/util/instance_util.go	44.01% <88.88%> (ø)	⬆️
... and 5 more

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[coveralls]

Coverage increased (+0.2%) to 70.119% when pulling 658a594 on little-cui:master into b7710a3 on ServiceComb:master.