devtool: add search command

Adds a subcommand to search to find the target recipe name providing
some file or capability. This is implemented by searching on recipe
name, package name, description, package contents (file names), and
runtime file provides. For example:

$ devtool search libGL
mesa

$ devtool search X11
xextproto
libxxf86vm
xf86driproto
xf86vidmodeproto
libxfixes
xproto
libx11
...

$ devtool search /bin/sed
busybox
sed

This is particularly useful within the extensible SDK but is also made
available in devtool alongside the build system.

Note of course that because this searches pkgdata, useful results depend
upon do_packagedata(_setscene) having executed for the recipe being
searched for.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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