Make {A, L}San allocator more compact.

Make {A, L}San allocator more compact.

This change tries to reduce memory consumption of {A, L}Saned image by hacking
primary allocator internals:

	* Reduce region size 2^20 -> 2^17.
	* Make largest chunk size in primary allocator 2^17 -> 2^16.

The change appears to be quite useful for LSan'ed image:

Stock version:
           total      used      free     shared    buffers     cached
Mem:        964        828       136        3         4         92

Patched version:
           total      used      free     shared    buffers     cached
Mem:        964        688       275        5         13        185

Change-Id: I80b95f7dfb5a7be0e7208567a31606a3d027256c
Signed-off-by: Maxim Ostapenko <m.ostapenko@samsung.com>