Fix GH-10000: Test failures when OpenSSL compiled with no-dsa

Pass signature to openssl_verify in bug81713 test

Fix bug #50293 and #81713: file path checking in OpenSSL functions

It introduces a single function to check file paths passed to OpenSSL
functions. It expands the path, check null bytes

Fix bug #50293 and #81713: file path checking in OpenSSL functions

It introduces a single function to check file paths passed to OpenSSL
functions. It expands the path, check null bytes and finally does
an open basedir check.

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