Make integration tests more user-friendly

[ethantkoenig]

Check that ./gitea binary exists, and don't print buffer.String() in assert message, since the buffer may contain an entire HTML page.

[lafriks]

LGTM

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[lunny]

I think we should find a method to only run one integration test function.

[sapk]

@lunny It is possible manually like any go test (with little sugar ^^) : go test -c code.gitea.io/gitea/integrations -o integrations.sqlite.test -tags 'sqlite' && GITEA_ROOT="$GOPATH/src/code.gitea.io/gitea" GITEA_CONF=integrations/sqlite.ini ./integrations.sqlite.test -test.v -test.run GPG

[sapk]

LGTM

[lunny]

@sapk I know that, I mean a friendly method.

[sapk]

@lunny Maybe by adding local arg for test TEST_MASK ?