Pagers can now share their own private capabilities with their
paged children, or their siblings with whom they have a common pager
ancestor.
Added flags CAP_SHARE_CHILD and CAP_SHARE_SIBLINGS for that.
Pagers by default do not share their capabilities with their children.
By using one of CAP_SHARE_SPACE, CAP_SHARE_GROUP or CAP_SHARE_CONTAINER
a pager may now share its capabilities with a collection of threads.
Test container is planned to test codezero microkernel extensively.
With these changes, everything is there to develop a full-featured test suite.
It also exemplifies how a new container type can be added to the system.
(cherry picked from commit f21fa53df421bfc8eeeaa096c89b98beed436c60)
Removed dependency on hard-coded pager id. Pager id is now passed
as an environment string `pagerid' to tasks. Alternatively, this
could take space in the utcb of each task.
Added a per-container container.h that inclues useful definitions.
Hello world now is in a separate file not to modify main too often.
hello world now prints container name and id.
new file: conts/test/SConstruct
new file: conts/test/container.c
new file: conts/test/include/linker.lds
new file: conts/test/include/test.h
new file: conts/test/main.c
new file: conts/test/src/test.c
modified: scripts/bare/bare_generator.py
