Upgrade pylint to version 2.x

[joachimmetz]

Upgrade pylint to version 2.1.1

also add python3 packages

pylint 1.7 and 2.x versions do not seem compatible with one and other. Use approach below to migrate to pylint 2.x

[joachimmetz]

• [x] Create l2tbinaries pylint test
• [x] Create pylint2 PPA for pylint 1.7.x
• [x] Migrate CI tests to use pylint2 PPA
  • https://github.com/log2timeline/l2tdevtools/pull/475
  • https://github.com/log2timeline/dfdatetime/pull/123
  • https://github.com/log2timeline/dfwinreg/pull/104
  • https://github.com/log2timeline/dfvfs/pull/318
  • plaso https://github.com/log2timeline/plaso/commit/37c0b0e3e3c33a705ca33ec27cfda9d87c8e86a1
  • l2tpreg https://github.com/log2timeline/l2tpreg/commit/96162c967e7f33c40001a91c403219baafd983ad
• [x] Create pylint3 PPA for pylint 2.x
• [x] l2tbinaries add pylint3 PPA test
• [x] Add CI tests that use pylint3 PPA
  • l2tdevtools - https://github.com/log2timeline/l2tdevtools/pull/560
  • dfdatetime - https://github.com/log2timeline/dfdatetime/pull/136
  • dfwinreg - https://github.com/log2timeline/dfwinreg/pull/109
  • dfvfs - https://github.com/log2timeline/dfvfs/pull/371
  • plaso - https://github.com/log2timeline/plaso/pull/2299
  • l2tpreg - not Python 3 ready - project has been archived
• [x] remove pylint 1.x support from l2devtools https://github.com/log2timeline/l2tdevtools/pull/583
• [x] l2tbinaries remove pylint2 PPA test
• [x] remove pylint2 PPA - tracked in https://github.com/log2timeline/l2tdevtools/issues/518