build: upgrade node to 8.8.1 (#471)

* build: upgrade to nodejs 8.8.1 and npm 5.5.1

* ci: upgrade the npm to the latest version in ci files

* build: remove duplication from clean script

packages/uhk-agent/package-lock.json

@@ -1770,10 +1770,6 @@
 						}
 					}
 				},
-				"string_decoder": {
-					"version": "0.10.31",
-					"bundled": true
-				},
 				"string-width": {
 					"version": "1.0.2",
 					"bundled": true,
@@ -1783,6 +1779,10 @@
 						"strip-ansi": "3.0.1"
 					}
 				},
+				"string_decoder": {
+					"version": "0.10.31",
+					"bundled": true
+				},
 				"stringstream": {
 					"version": "0.0.5",
 					"bundled": true
@@ -2338,11 +2338,6 @@
 				"tweetnacl": "0.14.5"
 			}
 		},
-		"string_decoder": {
-			"version": "0.10.31",
-			"resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
-			"integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ="
-		},
 		"string-width": {
 			"version": "1.0.2",
 			"resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
@@ -2353,6 +2348,11 @@
 				"strip-ansi": "3.0.1"
 			}
 		},
+		"string_decoder": {
+			"version": "0.10.31",
+			"resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+			"integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ="
+		},
 		"stringstream": {
 			"version": "0.0.5",
 			"resolved": "https://registry.npmjs.org/stringstream/-/stringstream-0.0.5.tgz",