Iotlabsshcli

-----

+ bump parallel-ssh to version 2
+ renaming for Open Linux nodes

-----

+ Force parallel-ssh to 1.5.5 because of a breaking refactoring introduced in
1.6.0

-----

+ Fix --jmespath and --format options not taken into account
+ Remove remaining occurences of old cli-tools names

-----

- deprecate open-a8-cli command
+ add iotlab-ssh command
+ use pytest

-----

+ add run-cmd, copy-file commands
+ add run-on-frontend option to run-cmd and run-script commands
+ setup Travis CI and Codecov
+ add run-script, wait-for-boot, flash-m3, reset-m3 commands