Inet toolkit 3.4.0 for IBM Streams

New in this release:

• #358 Samples: Makefiles prepared for CP4D buildservice (build with VS Code)
• #356 Update httpclient to 4.5.13
  Checksum for archive streamsx.inet.toolkit-3.4.0-el7-amd64-31a388a-20201116-1126.tgz
  MD5: c1c9a4a86706974dc3fc1a41b4ab45c5
  sha1: 533a7e6b7392b5e59313f09f158f84ad94ab3696