Add script for checking i18n message
Add script for checking i18n message

Part of bp make-string-localizable

usage: tox -e i18n

tools/check_i18n.py: used check i18n message for one file.

tools/check_i18n_test_case.txt: test case of check_i18n.py.
run test case with cmd:
$ ./tools/check_i18n.py ./tools/check_i18n_test_case.txt -d

Change-Id: I2c383b7bb11ab3bdb8e3bb3b887342b1225840ac

Gitweijie/first_project,cisco-openstack/networking-cisco,nikolay-fedotov/networking-cisco,hareeshpc/networking-cisco,noironetworks/networking-cisco,Tehsmash/networking-cisco-nexus,Gitweijie/first_project,noironetworks/networking-cisco,CiscoSystems/networking-cisco,openstack/networking-cisco,Tehsmash/networking-cisco,Tehsmash/networking-cisco-apic,Tehsmash/networking-cisco,hareeshpc/networking-cisco,openstack/networking-cisco,cisco-openstack/networking-cisco,CiscoSystems/networking-cisco