rename x86 board as unity

Signed-off-by: Wilfried Chauveau <ithinuel@gmail.com>
add system_boot & basic task handling.
Need to be unit_tested

Signed-off-by: Wilfried Chauveau <ithinuel@gmail.com>
fix missing include & pthread link flag

Signed-off-by: Wilfried Chauveau <ithinuel@gmail.com>
unit test Unix task port

Signed-off-by: Wilfried Chauveau <ithinuel@gmail.com>
add test to task_mock module

Signed-off-by: Wilfried Chauveau <ithinuel@gmail.com>
Merge pull request #5 from ithinuel/generic_boot

Generic boot