[Rpm-maint] [rpm-software-management/rpm] OpenPGP: Function `pgpParsePkts` supports only "PGP PUBLIC KEY BLOCK" block, "PGP SIGNATURE" is needed (Issue #2512)

[Jaroslav Rohel]

@nwalfield 
Here is the PR https://github.com/rpm-software-management/librepo/pull/275 . It contains commit that moves the original implementation of OpenPGP using GpgMe into "gpg_gpgme.c" file and creates a new based on librpm API in the "gpg_rpm.c" file.
There is a function `check_signature` which internally calls `pgpParsePkts` to parse the ASCII armored OpenPGP signature. 

I created the code based on the description in the "rpmgpg.h" header file and a bit of librpm reverse engineering. It's not very nice, but somehow it works. The code also implements a keyring.

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