veyron/services/mgmt/node: fixing test failure on Jenkins

Replacing Mkdir() with MkdirAll() to prevent the former failing if the
test directory to be created already exists (as it is the case on
Jenkins).

Change-Id: I23a034ddb32c1a137a472287c9cee60004113c36
1 file changed
tree: 47d52f7af79d1634c34f196521a5f0ed6f78fcdc
  1. examples/
  2. lib/
  3. products/
  4. runtimes/
  5. security/
  6. services/
  7. tools/