Service inventory changes for further protos review (istio#20)

* Service inventory changes for further protos review:

- Consolidated all proto definitions into service.proto
- Minor changes to Makefile, client print formatting, etc.

* - Let inventory-server stay-up, and retry DB Ping, instead of exiting
- Test connection when DB ping fails

* Fixes based on earlier PR comments. Following are now taken care:

- Redefined service.proto to accommodate standards, reorganized/consolidated names, comments, etc.
- Reworked corresponding handler code proto references

* Additional fixes based on PR comments incorporating proto file reformatting,
service name changes, and similar. Corresponding code changes to accommodate these.

* Service proto changes, new service ListServices(ListServicesRequest),
added empty metadata; Retaining proto package as v1alpha as-is

* Follow-up PR review changes accommodating:

- rename proto package to "api/inventory/v1" from "api/inventory/v1alpha";
  corresponding go package import changes
- rearranged service.proto message definitions
- Proto major changes: Metadata.spec to Service.ports; Workload.ou to Metadata.ou
- gRPC client takes an address "inventory-client <address>"
- PSQL reconnect timer changed to 5s from 30s

* Continuation of earlier PR commit 2019604

* Service Inventory updates accommodating:

- Rid of DB population at init time, instead separated inventory-test to add entries to DB
- CreateServices now take Service protobuf as parameter to unmarshall protobuf into
  to PLSQL; Similarly, ListServices will now marshall's service protobuf to ListServicesResponse
- DB tables, macros, handler routines to persist/retrieve metadata, endpoint, cluster, workload

* Service Inventory changes accommodating:

- renamed "cmd/test" to "cmd/test-data" for populating test DB data
- batched unmarshalling of queries to populate DB rows
- updated service name to envoyfilter.yaml

* Service Inventory changes accommodating:
(included the rest)
- renamed "cmd/test" to "cmd/test-data" for populating test DB data
- batched unmarshalling of queries to populate DB rows
- updated service name to envoyfilter.yaml

Mirrored from https://github.com/tetrateio/tetrate @ 7b052834d21911a0ad1d1bc1613ddaff07c09155

inventory/v1alpha1/Makefile → inventory/v1/Makefile

@@ -1,16 +1,15 @@
 # Copyright (c) Tetrate, Inc 2018 All Rights Reserved.
 
 TOPDIR := ${PWD}
-VENDOR := ${GOPATH}/src/github.com/tetrateio/tetrate/third_party/protobuf
+VENDOR := ${GOPATH}/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis
 
 PROTO_SOURCES = $(wildcard *.proto)
 PROTO_GO_SOURCES = $(patsubst %.proto,%.pb.go,$(PROTO_SOURCES))
 
 ${PROTO_GO_SOURCES}: ${PROTO_SOURCES}
-	@protoc \
-		-I ${TOPDIR}/ \
-		-I ${VENDOR} \
-		--go_out=plugins=grpc:. \
+	@protoc -I ${TOPDIR}/ \
+		-I${VENDOR} \
+		--go_out=plugins=grpc:${GOPATH}/src/ \
 		--descriptor_set_out=inventory.proto-descriptor --include_imports \
 		$?
 
@@ -20,5 +19,4 @@ all: ${PROTO_GO_SOURCES}
 .PHONY: all
 
 clean:
-	@rm -f ${PROTO_GO_SOURCES} inventory.proto-descriptor
-	@echo "Cleaned ${PROTO_GO_SOURCES}"
+	@echo "Cleaned nothing"