add basic test scripts

[ghost]

tests:

• 6lowpan
• ethernet
• heartbeat
• nand
• nor
• sdcard
• switch
• audio
• mic
• spi uart leds

Current status of verification (on Ci-40 rev4):

• 6lowpan: works
• ethernet: works
• heartbeat: works but rely on https://github.com/FlowM2M/openwrt/pull/21
• nand: work
• nor: works
• sdcard: does not work because mkfs.ext4 is not found (pull request https://github.com/CreatorKit/build/pull/22)
• switch: works
• audio: works
• mic: works
• spi uart leds: works but rely on https://github.com/FlowM2M/openwrt/pull/21

usleep does not work because it is not enabled in busybox (pull request https://github.com/CreatorKit/build/pull/24)

[ghost]

audio & mic will follow in another commit

[abhijit-mahajani-imgtec]

Copyright notice should be 2016 3-clause BSD. Package version 0.1.0

[ghost]

Done

[abhijit-mahajani-imgtec]

we need to remove the click tests from board-test. mostly click test can be diff repo