tests for pkg/auth/manager/(demo|json)

[unixlab]

After pkg/user/manager/ now tests for pkg/auth/manager/demo/

$ go test -cover github.com/cs3org/reva/pkg/auth/manager/demo
ok  	github.com/cs3org/reva/pkg/auth/manager/demo	0.003s	coverage: 100.0% of statements

and pkg/auth/manager/json/

$ go test -cover github.com/cs3org/reva/pkg/auth/manager/json
ok  	github.com/cs3org/reva/pkg/auth/manager/json	0.004s	coverage: 100.0% of statements

[codecov-io]

Codecov Report

Merging #214 into master will increase coverage by 1.59%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #214      +/-   ##
==========================================
+ Coverage   93.05%   94.65%   +1.59%     
==========================================
  Files           4        6       +2     
  Lines         144      187      +43     
==========================================
+ Hits          134      177      +43     
  Misses          5        5              
  Partials        5        5

Impacted Files	Coverage Δ
pkg/auth/manager/demo/demo.go	100% <0%> (ø)
pkg/auth/manager/json/json.go	100% <0%> (ø)

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[labkode]

Thanks a lot for this effort!