Installing a Plug-in should not pass the plugin scoped registry as global registry on the NPM install command

[awharn]

Describe the bug

When:

• A user does NOT have a global registry configured
• A user has a scoped registry (i.e npm config set @zowe:registry https://zowe.jfrog.io/artifactory/api/npm/npm-local-release/)
• The user installs a plug-in with that scope (i.e. @zowe/zos-ftp-for-zowe-cli@zowe-v3-lts)

Zowe CLI appends --registry https://zowe.jfrog.io/artifactory/api/npm/npm-local-release/ to the npm install command run behind the scenes. Since that registry might not contain certain packages such as zos-node-accessor@2.0.11, the installation might fail. The scoped registry should not be passed through as a global registry.

zowe-cli/packages/imperative/src/imperative/src/plugins/cmd/install/install.handler.ts

Lines 76 to 96 in 027d9cc

	private locationTypeTest(plugin: string){
	let isDirTest: boolean;
	let installRegistry = getRegistry();
	try {
	isDirTest = IO.isDir(plugin);
	} catch (e) {
	isDirTest = false;
	}
	if (plugin.startsWith("@")) {
	installRegistry = getScopeRegistry(
	plugin.split("/")[0].substring(1)
	).replace("\n", "");
	} else if (
	plugin.substring(plugin.lastIndexOf(".") + 1) === "tgz" ||
	isDirTest
	) {
	installRegistry = plugin;
	}
	return installRegistry;
	}

zowe-cli/packages/imperative/src/imperative/src/plugins/cmd/install/install.handler.ts

Lines 220 to 244 in 027d9cc

	if (typeof params.arguments.registry === "undefined") {
	installRegistry = this.locationTypeTest(plugin);
	} else {
	installRegistry = params.arguments.registry;
	if (params.arguments.login) {
	npmLogin(installRegistry);
	}
	}
	params.response.console.log(
	"Plug-ins within the Imperative CLI Framework can legitimately gain\n" +
	`control of the ${ImperativeConfig.instance.rootCommandName} CLI application ` +
	"during the execution of every command.\n" +
	"Install 3rd party plug-ins at your own risk.\n"
	);
	params.response.console.log(
	"Location = " + installRegistry
	);
	params.response.console.log(
	"\n_______________________________________________________________"
	);
	const pluginName = await install(
	`${plugin}`,
	installRegistry
	);

zowe-cli/packages/imperative/src/imperative/src/plugins/utilities/npm-interface/install.ts

Line 125 in 027d9cc

installPackages(PMFConstants.instance.PLUGIN_INSTALL_LOCATION, registry, npmPackage);

zowe-cli/packages/imperative/src/imperative/src/plugins/utilities/NpmFunctions.ts

Lines 60 to 62 in 027d9cc

	if (!(registry.substring(registry.lastIndexOf(".") + 1) === "tgz") && !isDirTest) {
	args.push("--registry",registry);
	}

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