Implements the frontend logic for gNSI Certz (#559)

* Add support to write gNSI credentials metadata to DB

Signed-off-by: Pattela JAYARAGINI <pattelaj@google.com>

* Implements the frontend logic for gNSI Certz

Signed-off-by: Pattela JAYARAGINI <pattelaj@google.com>

---------

Signed-off-by: Pattela JAYARAGINI <pattelaj@google.com>
Co-authored-by: Neha Das <nehadas@google.com>

Author: jayaragini-hcl

Makefile

@@ -126,6 +126,17 @@ endif
 	git apply patches/0001-Updated-to-filter-and-write-to-file.patch
 	git apply patches/0003-Fix-client-json-parsing-issue.patch
 
+# Manually adding patched client packages and their dependencies
+# to vendor/modules.txt. This satisfies 'go install -mod=vendor' lookup checks,
+# which are required after manual patching/copying of gnxi and gnmi-cli code.
+	echo "github.com/google/gnxi v0.0.0-20181220173256-89f51f0ce1e2" >> vendor/modules.txt
+	echo "github.com/google/gnxi/gnmi_get" >> vendor/modules.txt
+	echo "github.com/google/gnxi/gnmi_set" >> vendor/modules.txt
+	echo "github.com/openconfig/gnmi/cli" >> vendor/modules.txt
+	echo "github.com/openconfig/gnmi/client/flags" >> vendor/modules.txt
+	echo "golang.org/x/crypto/ssh/terminal" >> vendor/modules.txt
+	echo "github.com/openconfig/gnmi/cmd/gnmi_cli" >> vendor/modules.txt
+
 ifeq ($(CROSS_BUILD_ENVIRON),y)
 	$(GO) build -o ${GOBIN}/gnmi_get -mod=vendor github.com/google/gnxi/gnmi_get
 	$(GO) build -o ${GOBIN}/gnmi_set -mod=vendor github.com/google/gnxi/gnmi_set