classes/kernel-check: add a class to check kernel config options

Some user-space software has specific requirements about the kernel
configuration options selected. This class allows a recipe to explicitly
state the kernel configuration options it needs (through a
REQUIRED_KERNEL_OPTIONS variable). This is a space separated list, where
each item is one of:
  (a) an option name (e.g. CONFIG_FHANDLE, in which case CONFIG_FHANDLE
      must be set to y or m to match)
  (b) optionname=value (e.g. CONFIG_FHANDLE=y, in which case
      CONFIG_FHANDLE must be set to y). If the specified value is n,
      it will also match if the option is not present.
  (c) optionname1|optionname2|... (e.g.
      CONFIG_EXT2_FS|CONFIG_EXT4_USE_FOR_EXT23, meaning that either
      CONFIG_EXT2_FS or CONFIG_EXT4_USE_FOR_EXT23 must be set to y or
      m to match).

Inheriting the class will also add a dependency from do_configure on
virtual/kernel:do_shared_workdir so that the kernel config is there to
check. If one or more items are not matched, then a warning will be
printed at do_configure time. (This is a warning rather than an error
in case you are using linux-dummy with an externally built kernel).

A separate function is also provided should you wish to check a config
option from python code - but note you must only call this in a place
where you can guarantee that the kernel config has been written to the
sysroot (i.e. from a task that has virtual/kernel:do_shared_workdir in
its depends varflag value).

Fixes [YOCTO #5574].

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

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