Use Kitura-NIO 2

[pushkarnk]

With Swift 5, use Kitura-NIO 2.x

[pushkarnk]

The reason for the one failing build is:

dpkg: error processing archive /var/cache/apt/archives/python2.7-minimal_2.7.15~rc1-1ubuntu0.1_amd64.deb (--unpack):
 new python2.7-minimal package pre-installation script subprocess returned error exit status 1

I re-triggered this build thrice but it keeps failing here.

[ianpartridge]

I think Travis is having issues today.

[CLAassistant]

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