RQF1770481 - Add IGTF CA signing key

Source of key is:

• https://wiki.egi.eu/wiki/EGI_IGTF_Release
• http://repository.egi.eu/sw/production/cas/1/GPG-KEY-EUGridPMA-RPM-3

Repository is already configured

gpg GPG-KEY-EUGridPMA-RPM-3
gpg: WARNING: no command supplied.  Trying to guess what you mean ...
pub   dsa1024 2005-07-12 [SCA]
      D12E922822BE64D50146188BC32D99C83CDBBC71
      uid           EUGridPMA Distribution Signing Key 3
      <info@eugridpma.org>

[UMD-4-EGI-trustanchors]
name=EGI-trustanchors
baseurl=http://repository.egi.eu/sw/production/cas/1/current
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/GPG-KEY-EUGridPMA-RPM-3

gpgkeys/GPG-KEY-EUGridPMA-RPM-3

+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v1.2.1 (GNU/Linux)
+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+=qXx1
+-----END PGP PUBLIC KEY BLOCK-----