INET/LWIP: minimal net.route sysctl support

At a point not too far in the future, we will be switching from the
hardcoded MINIX3 implementation of the getifaddrs(3) libc routine to
the proper NetBSD

INET/LWIP: minimal net.route sysctl support

At a point not too far in the future, we will be switching from the
hardcoded MINIX3 implementation of the getifaddrs(3) libc routine to
the proper NetBSD implementation. The latter uses the
net.route.rtable sysctl functionality to obtain its information. In
order make the transition as painless as possible, this patch adds
basic support for that net.route.rtable functionality to INET and
LWIP, using the remote MIB (RMIB) facility.

Change-Id: I54f5cea7985f6606e317c73a5e6be3a5d07bc7dc

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trace(1): resolve all level-5 LLVM warnings

Change-Id: If5ffe97eb0b15387b1ab674657879e13f58fb27e

MIB: add support for System V IPC information node

The kernel.ipc.sysvipc_info node is the gateway from NetBSD ipcs(1)
and ipcrm(1) to the IPC server, and thus necessary for a clean
import of these

MIB: add support for System V IPC information node

The kernel.ipc.sysvipc_info node is the gateway from NetBSD ipcs(1)
and ipcrm(1) to the IPC server, and thus necessary for a clean
import of these two utilities. The MIB service implementation uses
the preexisting (Linux-specific) information calls on the IPC server
to obtain the information.

Change-Id: I85d1e193162d6b689f114764254dd7f314d2cfa0

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MIB: initial tree population

Change-Id: I28ef0a81a59faaf341bfc15178df89474779a136

Add MIB service, sysctl(2) support

The new MIB service implements the sysctl(2) system call which, as
we adopt more NetBSD code, is an increasingly important part of the
operating system API. The s

Add MIB service, sysctl(2) support

The new MIB service implements the sysctl(2) system call which, as
we adopt more NetBSD code, is an increasingly important part of the
operating system API. The system call is implemented in the new
service rather than as part of an existing service, because it will
eventually call into many other services in order to gather data,
similar to ProcFS. Since the sysctl(2) functionality is used even
by init(8), the MIB service is added to the boot image.

MIB stands for Management Information Base, and the MIB service
should be seen as a knowledge base of management information.

The MIB service implementation of the sysctl(2) interface is fairly
complete; it incorporates support for both static and dynamic nodes
and imitates many NetBSD-specific quirks expected by userland. The
patch also adds trace(1) support for the new system call, and adds
a new test, test87, which tests the fundamental operation of the
MIB service rather thoroughly.

Change-Id: I4766b410b25e94e9cd4affb72244112c2910ff67

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