initial Jenkinsfile (#8201)

Jenkinsfile

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+pipeline {
+  agent {
+    docker {
+      image 'px4io/px4-dev-simulation:2017-09-26'
+      args '--env=CCACHE_DISABLE --env=CI'
+    }
+    
+  }
+  stages {
+    stage('Quick Check') {
+      steps {
+        sh '''make distclean;
+make posix_sitl_default;'''
+      }
+    }
+  }
+  environment {
+    CI = '1'
+    CCACHE_DISABLE = '1'
+  }
+}