HTTP & TCP integrations API

[varas]

Updated HTTP API to support all integration protocols.

Updated HTTP API to support Windows.

Simple TCP socket API. For now limited to:

• ingests usual integration payloads (https://docs.newrelic.com/docs/create-integrations/infrastructure-integrations-sdk/specifications/host-integration-executable-file-json-specifications)
• payloads are ingested in a per line basis (as usual integration protocol)
• uses raw TCP, port configurable via tcp_server_port, default 8002

You can start playing around by:

• writing JSON payload lines into TCP like nc localhost 8002 (enable with tcp_server_enabled: true)
• posting HTTP payload like curl -d "{ "protocol_version": "4", ... }" localhost:8001/v1/data (enable with http_server_enabled: true)

[coveralls]

Pull Request Test Coverage Report for Build 405526337

• 65 of 155 (41.94%) changed or added relevant lines in 9 files are covered.
• 9 unchanged lines in 4 files lost coverage.
• Overall coverage increased (+0.03%) to 58.102%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cmd/newrelic-infra/newrelic-infra.go	0	7	0.0%
internal/integrations/v4/integration/integration.go	9	20	45.0%
pkg/helpers/network/network_helpers.go	0	11	0.0%
pkg/plugins/plugins_linux.go	0	11	0.0%
pkg/plugins/http_server.go	15	27	55.56%
internal/socketapi/socketapi.go	35	53	66.04%
internal/plugins/linux/hostinfo.go	0	20	0.0%

Files with Coverage Reduction	New Missed Lines	%
cmd/newrelic-infra/newrelic-infra.go	1	7.49%
internal/integrations/v4/integration/integration.go	2	52.56%
pkg/metrics/sampler/sampler_routine.go	2	94.74%
pkg/integrations/v4/logs/cfg_watcher.go	4	67.5%

Totals
Change from base Build 400950830:	0.03%
Covered Lines:	11334
Relevant Lines:	19507

---

💛 - Coveralls

[cristianciutea]

LGTM

[carlosroman]

Maybe worth adding the following?

Suggested change

	defer listener.Close()

[varas]

added along with return