recipetool: add appendsrcfile(s) sub-commands

This adds the `appendsrcfile` and `appendsrcfiles` sub-commands, which let the
user add or replace one or more files in the recipe sources, either in a path
relative to `S` or `WORKDIR`. Each file gets added to `SRC_URI` as a file://
URI, using the subdir= parameter to specify the destination directory.

Examples:

    # Adds our defconfig as file://defconfig. If it's already in SRC_URI, it
    # won't be duplicated.
    recipetool appendsrcfile --workdir meta-mylayer linux-mel defconfig
    recipetool appendsrcfiles --workdir meta-mylayer linux-mel defconfig

    # Does the same, handling the different local filename
    recipetool appendsrcfile --workdir meta-mylayer linux-mel defconfig.mine defconfig

    # Adds our device tree files to the source tree
    recipetool appendsrcfiles --destdir arch/arm/boot/dts meta-mylayer linux-mel *.dts

Of course, for the latter example to be of use, the new dts files would need
to be added to `KERNEL_DEVICETREE` as well, and depending on the kernel,
`DEFCONFIG` or `KERNEL_DEFCONFIG` may need to be set.

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

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