[sr-dev] [kamailio/kamailio] tls: add support for OpenSSL engine and private keys in HSM (#1484)

[aalba6675]

You will notice that the PR moves HSM private keys loading to child (after fork()). Some further explanation is in order:

Engines like AWS CloudHSM(SafeNet "gem" and "LunaCA3" engines) are wrappers around their PKCS 11 implementations. Some of these libraries do not behave predictably after fork(). For example, if the token is initialized in master, then some HSM keys loaded, the handles can become invalid in a fork()'ed child or you will get weird runtime errors.

GNUTLS describes this problem: https://www.gnutls.org/manual/gnutls.html#PKCS11-Initialization

Using opensc or SoftHSM2  is usually not a problem as they handle fork() properly.

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