[Rpm-maint] [rpm-software-management/rpm] IDENTITY as header tag extension discussion (#426)

[wladmis]

The previous discussion was [here](http://lists.rpm.org/pipermail/rpm-maint/2018-April/007718.html).

Main thought:
- compute identity as a digest of filtered iterated pair of tags and its values of immutable header region;
- change the awk script that generates the tag table to add a marker (like the array return marker) to identify which tags to include (or exclude);

The tags that definitely should be filtered while calculation:
-  RPMTAG_ARCH;
-  RPMTAG_ARCHIVESIZE;
-  RPMTAG_AUTOINSTALLED;
-  RPMTAG_BUILDHOST;
-  RPMTAG_BUILDTIME;
-  RPMTAG_COOKIE;
-  RPMTAG_DBINSTANCE;
-  RPMTAG_DISTRIBUTION;
-  RPMTAG_DISTTAG;
-  RPMTAG_DISTURL;
-  RPMTAG_FILESTATES;
-  RPMTAG_HEADERIMMUTABLE;
-  RPMTAG_INSTALLCOLOR;
-  RPMTAG_INSTALLTID;
-  RPMTAG_INSTALLTIME;
-  RPMTAG_LONGARCHIVESIZE;
-  RPMTAG_LONGSIGSIZE;
-  RPMTAG_LONGSIZE;
-  RPMTAG_ORIGBASENAMES;
-  RPMTAG_ORIGDIRINDEXES;
-  RPMTAG_ORIGDIRNAMES;
-  RPMTAG_PAYLOADDIGEST;
-  RPMTAG_RELEASE;
-  RPMTAG_RSAHEADER;
-  RPMTAG_SHA1HEADER;
-  RPMTAG_SHA256HEADER;
-  RPMTAG_SIGLEMD5_1;
-  RPMTAG_SIGLEMD5_2;
-  RPMTAG_SIGMD5;
-  RPMTAG_SIGPGP;
-  RPMTAG_SIGSIZE;
-  RPMTAG_SIZE;

--
P.S. Since RPMTAG_RELEASE is supposed to be filtered, there is sense to filter some elemenents of package RPMTAG_PROVIDE* and RPMTAG_REQUIRE*

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