Blame SOURCES/BZ-1358492-installonly-kernel.patch

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diff -up yum-3.4.3/yum/config.py.old yum-3.4.3/yum/config.py
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--- yum-3.4.3/yum/config.py.old	2017-10-06 13:24:25.014855429 +0200
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+++ yum-3.4.3/yum/config.py	2017-10-06 13:36:38.602637131 +0200
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@@ -755,6 +755,7 @@ class YumConf(StartupConf):
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     username = Option()
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     password = Option()
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     installonlypkgs = ListOption(['kernel', 'kernel-bigmem',
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+                                  'installonlypkg(kernel)',
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                                   'installonlypkg(kernel-module)',
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                                   'installonlypkg(vm)',
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             'kernel-enterprise','kernel-smp', 'kernel-debug',