conf: do not exclude Fedora kernel for dom0

We do not need custom patches for dom0 kernel anymore, so make it
possible to install kernel from Fedora repo (which probably will be
somehow newer than our own).

conf/qubes-kickstart.cfg

@@ -4,8 +4,8 @@
 # (@base is added by default unless you add --nobase to %packages)
 # (default groups for the configured repos are added by --default)
 
-repo --name=fedora --gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-20-primary --ignoregroups=true --mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=fedora-20&arch=$basearch --excludepkgs=kernel,kernel-*
-repo --name=fedora-updates --gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-20-primary --ignoregroups=true --mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=updates-released-f20&arch=$basearch --excludepkgs=kernel,kernel-*
+repo --name=fedora --gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-20-primary --ignoregroups=true --mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=fedora-20&arch=$basearch
+repo --name=fedora-updates --gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-20-primary --ignoregroups=true --mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=updates-released-f20&arch=$basearch
 repo --name=installer --baseurl=file:///tmp/qubes-installer/yum/installer/
 repo --name=qubes-dom0 --baseurl=file:///tmp/qubes-installer/yum/qubes-dom0/
 repo --name=dom0-updates --baseurl=file:///tmp/qubes-installer/yum/dom0-updates/