AIX: Mappings for host memory info

[asalih]

According to the documentation, the perfstat_memory_total interface includes additional items so I've mapped them to the Metrics field of the types.HostMemoryInfo.

Result on my aix 7.2 environment:

New types.HostMemoryInfo.Metrics attributes being added.

Item	Descriptor
bytes_coalesced	Number of bytes of the calling partition’s logical real memory coalesced
bytes_coalesced_mempool	Number of bytes of logical real memory coalesced in the calling partition’s memory pool if the calling partition is authorized to see pool wide statistics else, set to zero.
real_pinned	Amount of pinned memory in bytes.
pgins	Number of pages paged in .
pgouts	Number of pages paged out.
pgsp_free	Amount of free paging space in bytes.
pgsp_rsvd	Amount of reserved paging space in bytes.