kernel: Refactor, unifying _pend_current_thread() + _Swap() idiom

Everywhere the current thread is pended, the code is going to have to
do a _Swap() soon afterward, yet the scheduler API exposed these as
separate steps.  Unify this pattern everywhere it appears, which saves
some code bytes and gets _Swap() out of the general scheduler API at
zero cost.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>