Add watchman installation check

Summary: Doctor to show warning if Watchman is not available

Reviewed By: mweststrate

Differential Revision: D19298730

fbshipit-source-id: 68f915c63c5f78aad91f549aabda8d4d972f4e39

src/reducers/__tests__/healthchecks.node.tsx

@@ -24,6 +24,7 @@ const HEALTHCHECKS: Healthchecks = {
     isRequired: true,
     healthchecks: [
       {
+        key: 'ios.sdk',
         label: 'SDK Installed',
         run: async (_env: EnvironmentInfo) => {
           return {hasProblem: false};
@@ -37,6 +38,7 @@ const HEALTHCHECKS: Healthchecks = {
     isRequired: true,
     healthchecks: [
       {
+        key: 'android.sdk',
         label: 'SDK Installed',
         run: async (_env: EnvironmentInfo) => {
           return {hasProblem: true};
@@ -50,6 +52,7 @@ const HEALTHCHECKS: Healthchecks = {
     isRequired: false,
     healthchecks: [
       {
+        key: 'common.openssl',
         label: 'OpenSSL Istalled',
         run: async (_env: EnvironmentInfo) => {
           return {hasProblem: false};