Merge branch 'umd' into 'master'

disable gpgkeys to UMD-4-preview repo

See merge request !232

prod.repos.d/UMD.repo

-[UMD-4-7-x86_64-base-6]
-name=UMD 4 base (SL6) x86_64
-baseurl=http://repository.egi.eu/sw/production/umd/4/sl6/x86_64/base
-enabled=1
-gpgcheck=1
-gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-emi file:///etc/pki/rpm-gpg/RPM-GPG-KEY-IGE file:///etc/pki/rpm-gpg/UMD-RPM-PGP-KEY file:///etc/pki/rpm-gpg/RPM-GPG-KEY-QCG file:///etc/pki/rpm-gpg/RPM-GPG-KEY-nordugrid file:///etc/pki/rpm-gpg/0608B895.txt
-
-[UMD-4-7-x86_64-updates-6]
-name=UMD 4 updates (SL6) x86_64
-baseurl=http://repository.egi.eu/sw/production/umd/4/sl6/x86_64/updates
-enabled=1
-gpgcheck=1
-gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-emi file:///etc/pki/rpm-gpg/RPM-GPG-KEY-IGE file:///etc/pki/rpm-gpg/UMD-RPM-PGP-KEY file:///etc/pki/rpm-gpg/RPM-GPG-KEY-QCG file:///etc/pki/rpm-gpg/RPM-GPG-KEY-nordugrid file:///etc/pki/rpm-gpg/0608B895.txt
-
 [UMD-4-7-x86_64-base]
 name=UMD 4 base (CentOS7) x86_64
 baseurl=http://repository.egi.eu/sw/production/umd/4/centos7/x86_64/base
@@ -37,7 +23,7 @@ gpgkey=file:///etc/pki/rpm-gpg/GPG-KEY-EUGridPMA-RPM-3
 name=Repository for preview.repository (o/s: centos7 arch: x86_64)
 baseurl=http://repository.egi.eu/sw/untested/umd/4/centos7/x86_64/
 enabled=1
-gpgcheck=1
+gpgcheck=0
 
 [UMD-4-preview.community-repository-centos-7-x86_64]
 name=Repository for preview.repository (o/s: centos7 arch: x86_64)