common/buffer: For bufferlist add func is_aligned_size_and_memory.

common/buffer: For bufferlist add func is_aligned_size_and_memory.

For directIO requirement, we need check bufferpt whether size aligned
and the address aligned. To do this, we should call is_aligned &&
is_n_align_sized. Every func also list all ptr of bufferlist.
To reduce one list, we add is_aligned_size_and_memroy(align_size,
align_memory) which only need list once.

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>