Shared lib 2 (#740)

* created shared library slack_notify.groovy

vars/slack_notify.groovy

+def call() {
+       try {
+              
+                stage('slack_notify') {
+                     mainDir = sh(returnStdout: true, script: "echo $JOB_NAME").split('/')[-4].trim()
+                     slack_channel = mainDir.toUpperCase() + "_NOTIFY_SLACK_CHANNEL"
+                     if (slack_channel != null)
+                      slackSend (
+                         channel: slack_channel,
+                         color: 'danger',
+                         message: "Build Failed - ${env.JOB_NAME} ${env.BUILD_NUMBER} (<${env.BUILD_URL}|Open>)"
+                      )
+                        else if(env.GLOBAL_NOTIFY_SLACK_CHANNEL != null)
+                         slackSend (
+                            channel: "${env.GLOBAL_NOTIFY_SLACK_CHANNEL}",
+                            color: 'danger',
+                            message: "Build Failed - ${env.JOB_NAME} ${env.BUILD_NUMBER} (<${env.BUILD_URL}|Open>)"
+                       )
+                        else
+                         println ANSI_YELLOW + ANSI_BOLD + "Could not find slack environment variable. Skipping slack notification.." + ANSI_NORMAL
+      
+            }
+         }
+      catch (err){
+            throw err
+        }
+   }