[PATCH] --secontext: Implement displaying of expected context upon mismatch

[Renaud Métrich]

This patch add a new "mismatch" option to --secontext which enables to 
print the expected context extracted from SELinux database when it 
differs from current context.

This is very useful when troubleshooting SELinux issues.

Also available as a PR: https://github.com/strace/strace/pull/197

(and more details there).

Note: the code coverage is complete on my system running Fedora, but not 
on the CI because selabel_open()/selabel_lookup() isn't available in the 
provided libselinux library (which is known to return invalid contexts 
anyway).

I'm hence attaching my code coverage results as well for secontext.c and 
strace.c which are the 2 files modified.

Renaud.

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