add code coverage metrics

[cbrake]

one example:

https://app.codecov.io/gh/genjidb/genji/compare/403

[cbrake]

possible option: https://github.com/mattn/goveralls

[cbrake]

hmm:

[cbrake@ceres go]$ go test -p=1 -cover ./...
?       github.com/simpleiot/simpleiot  [no test files]
?       github.com/simpleiot/simpleiot/api      [no test files]
?       github.com/simpleiot/simpleiot/assets   [no test files]
?       github.com/simpleiot/simpleiot/assets/files     [no test files]
ok      github.com/simpleiot/simpleiot/client   5.761s  coverage: 40.9% of statements
?       github.com/simpleiot/simpleiot/cmd/boltutil     [no test files]
?       github.com/simpleiot/simpleiot/cmd/edge [no test files]
?       github.com/simpleiot/simpleiot/cmd/fetch        [no test files]
?       github.com/simpleiot/simpleiot/cmd/modbus       [no test files]
?       github.com/simpleiot/simpleiot/cmd/modbus-client        [no test files]
?       github.com/simpleiot/simpleiot/cmd/modbus-server        [no test files]
?       github.com/simpleiot/simpleiot/cmd/point-size   [no test files]
?       github.com/simpleiot/simpleiot/cmd/send-sms     [no test files]
?       github.com/simpleiot/simpleiot/cmd/serial-encode        [no test files]
?       github.com/simpleiot/simpleiot/cmd/siot [no test files]
?       github.com/simpleiot/simpleiot/cmd/siot-e2e-test        [no test files]
?       github.com/simpleiot/simpleiot/cmd/siotcmd      [no test files]
?       github.com/simpleiot/simpleiot/cmd/tof10120     [no test files]
?       github.com/simpleiot/simpleiot/contrib  [no test files]
ok      github.com/simpleiot/simpleiot/data     (cached)        coverage: 36.2% of statements
?       github.com/simpleiot/simpleiot/file     [no test files]
ok      github.com/simpleiot/simpleiot/frontend (cached)        coverage: [no statements]
?       github.com/simpleiot/simpleiot/gps      [no test files]
?       github.com/simpleiot/simpleiot/internal [no test files]
?       github.com/simpleiot/simpleiot/internal/pb      [no test files]
ok      github.com/simpleiot/simpleiot/modbus   (cached)        coverage: 53.9% of statements
?       github.com/simpleiot/simpleiot/msg      [no test files]
?       github.com/simpleiot/simpleiot/network  [no test files]
?       github.com/simpleiot/simpleiot/network/needsported      [no test files]
ok      github.com/simpleiot/simpleiot/node     (cached)        coverage: 1.1% of statements
?       github.com/simpleiot/simpleiot/particle [no test files]
ok      github.com/simpleiot/simpleiot/respreader       (cached)        coverage: 46.8% of statements
?       github.com/simpleiot/simpleiot/sensors  [no test files]
ok      github.com/simpleiot/simpleiot/server   (cached)        coverage: 6.7% of statements
?       github.com/simpleiot/simpleiot/sim      [no test files]
ok      github.com/simpleiot/simpleiot/store    (cached)        coverage: 55.7% of statements
ok      github.com/simpleiot/simpleiot/system   (cached)        coverage: 9.2% of statements
ok      github.com/simpleiot/simpleiot/test     (cached)        coverage: 43.8% of statements
?       github.com/simpleiot/simpleiot/tools    [no test files]

We are a long way from awesome-Go level of coverage requirements (80-90%) ...

Closing this for now ...