Merge pull request #7 from asowani/master

ppc64le support: "preset" modification.

Author: shahmishal

nodes/ppc64le_16_04.json

@@ -12,7 +12,7 @@
  {
  "display_name": "Swift - ppc64le (Tools RA, Stdlib RD) (swift-4.1-branch)",
  "branch": "swift-4.1-branch",
- "preset": "buildbot_linux,tools=RA,stdlib=RD"
+ "preset": "buildbot_incremental_linux"
  }
  ]
 }