Add in a hack to expose the general sysctlbyname API.
Migrate uinet_sysctl() to uinet_sysctlbyname() - it's the correct name for it.

Implement uinet_sysctl().
Merge pull request #1 from erikarn/master_adrian

Merged Adrian Chadd's exposure of sysctl routines in the UINET API.
Moved uinet_sysctl*() from uinet_config_kernel.c to uinet_api.c, which
is where everything should accrete until the next API cleanup pass.
Merge branch 'master' into passive_receive
And... move the uinet_sysctl*() prototypes to uinet_api.h.
Merge branch 'master' into passive_receive