This commit adds Solaris(^1) support for the Info() function of package
cpu, with the exception of the L2 cache size which is not trivially
available(^2).
Support is implemented by parsing the output of `isainfo -b -v` (for the
instruction set flags), and `psr-info -p -v` for other information.
Example outputs from a range of different size VMs and Joyent containers
are included as part of the tests.
(^1): This has only been tested with Illumos in the form of SmartOS. I
believe it to be portable to other Illumos distributions but have not
tested on Oracle Solaris.
(^2): Enough support is added here to be usable for my port of
HashiCorp's Nomad to SmartOS.
