Fix build break (#175)

New version of grpc-js required 'fs/promises', which does not exist in
the particular version of Node 12 included in the
hyperledger/fabric-nodeenv:2.2 image. This was fixed in grpc-js v1.12.2.

This change includes npm-shrinkwrap.json files for the Node chaincode
used by tests to avoid any unexpected future dependency version
resolution changes.

Signed-off-by: Mark S. Lewis <Mark.S.Lewis@outlook.com>

Author: bestbeforetoday

src/test/fixtures/chaincode/node/.gitignore

@@ -0,0 +1,2 @@
+node_modules
+package-lock.json

src/test/fixtures/chaincode/node/fabcar/npm-shrinkwrap.json

@@ -14,7 +14,7 @@
     "author": "Hyperledger",
     "license": "Apache-2.0",
     "dependencies": {
-        "fabric-contract-api": "~2.2",
-        "fabric-shim": "~2.2"
+        "fabric-contract-api": "~2.2.0",
+        "fabric-shim": "~2.2.0"
     }
 }