version-check.conf: add mechanism for checking version mismatch

Add a mechanism to check mismatch between runtime version and build time version.

To use, add the following line to local.conf:

  include conf/version-check.conf

Ideally, layers will have their own conf/version-check.conf to establish
some baseline, so that any future warning indicates some error. In such
case, users can use include_all:

  include_all conf/version-check.conf

The basic idea is to use qemu to run executables at build time, extract
possible versions, and check if there's a mismatch found.

Python meta data and .pc files are also checked for quick match. This
is because such info are also easy to be checked by users.

check-version-mismatch.bbclass is the class that does the actual work.
A new variable, CHECK_VERSION_PV, is introduced. It defaults to ${PKGV},
but also allows override. This allows us to handle special cases in each
layer.

version-check.conf is the configuration file that makes this functionality
easier to use and draws some baseline. It contains some override settings
for some recipes. With these overrides, all recipes in oe-core are handled
well. All warnings are valid warnings.

Note that 'ps' is added to HOSTTOOLS in version-check.conf. This is because
we need 'ps' to find stale processes and then clean them.

The warnings are like below:

  WARNING: time-1.9-r0 do_package_check_version_mismatch: Possible runtime versions ['UNKNOWN'] do not match recipe version 1.9
  WARNING: python3-unittest-automake-output-0.2-r0 do_package_check_version_mismatch: Possible runtime versions ['0.1'] do not match recipe version 0.2
  WARNING: pinentry-1.3.1-r0 do_package_check_version_mismatch: Possible runtime versions ['1.3.1-unknown'] do not match recipe version 1.3.1
  ...

There will be a data directory containing all details: tmp/check-version-mismatch.
This directory contains detailed data for each recipe that is built.
If users don't want it, they can set DEBUG_VERSION_MISMATCH_CHECK to 0.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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