Update node tests to match versions actually installed
MODIFY
tests/base/node10/README.md
tests/base/node10/README.md
-Test that node 10 is installed and runnable.
+Test that node 10 and npm 6 are installed and runnable.

MODIFY
tests/base/node10/verify
tests/base/node10/verify
set -e
which node
+node --version
node --version | grep v10
+
which npm
-npm --version | grep 6.2
+npm --version
+npm --version | grep 6.4

Update node tests to match versions actually installed