speed up user e2e tests

Signed-off-by: Sergei Ianovich <s@asutp.io>
tests: e2e: test changing

Signed-off-by: Sergei Ianovich <s@asutp.io>
tests: update invocation commands

`npm test` -- brief output of full test suite
`make test` -- details output of full test suite
`make test-karma` -- details output of browser sub-suite
`make test-mocha` -- details output of node sub-suite

Signed-off-by: Sergei Ianovich <s@asutp.io>