(CFACT 92) Add memory facts for solaris

This patch adds support for system memory facts for solaris. Since swap
requires different handling, it is not included in this patch.
(CFACT-103) Add swap memory facts for solaris

This patch adds support for swap memory facts for solaris. It utilizes the
solaris swapctl systemcall to get information about the swap memory.
Merge pull request #119 from vrthra/fix/cfact-92/solaris-memory-facts

(CFACT 92) Support for memory facts for solaris
(CFACT-120) Add zpool facts for solaris

This patch adds support for zpool facts for solaris. It includes current
version, supported features, and zpools available, their size and available
space.
(CFACT-120) Add zfs facts for solaris

This patch adds suppport for zfs facts for solaris. It lists the version,
supported features, and currently known properties of all zfs datasets