message: CentOS: update urls in docs for getting devtoolset
  replace "https://linux.web.cern.ch/linux/scientific[5-6]/docs/repository" with "http://linuxsoft.cern.ch"
diff: @@ -92,9 +92,9 @@ instructions for some popular distributions:
  <dd>Scientific Linux 5 provides gcc-4.8 packages that work on CentOS 5.
  First, make sure all your packages are up-to-date, via yum update. Then:
  <pre class="prettyprint lang-sh"
  ->sudo wget https://linux.web.cern.ch/linux/scientific6/docs/repository/cern/slc6X/i386/RPM-GPG-KEY-cern
  +>sudo wget http://linuxsoft.cern.ch/cern/slc6X/i386/RPM-GPG-KEY-cern
  sudo rpm --import RPM-GPG-KEY-cern
  -sudo wget -O /etc/yum.repos.d/slc5-devtoolset.repo https://linux.web.cern.ch/linux/scientific5/docs/repository/cern/devtoolset/slc5-devtoolset.repo
  +sudo wget -O /etc/yum.repos.d/slc5-devtoolset.repo http://linuxsoft.cern.ch/cern/devtoolset/slc5-devtoolset.repo
  sudo yum install devtoolset-2-gcc-c++ devtoolset-2-binutils</pre>
  Set the following variable before you build:
  <pre class="prettyprint lang-sh"
  @@ -105,8 +105,8 @@ Set the following variable before you build:
  <dt><b>CentOS 6</b></dt>
  <dd>Scientific Linux 6 provides gcc-4.8 packages that work on CentOS 6.
  <pre class="prettyprint lang-sh"
  ->sudo rpm --import https://linux.web.cern.ch/linux/scientific6/docs/repository/cern/slc6X/i386/RPM-GPG-KEY-cern
  -sudo wget -O /etc/yum.repos.d/slc6-devtoolset.repo https://linux.web.cern.ch/linux/scientific6/docs/repository/cern/devtoolset/slc6-devtoolset.repo
  +>sudo rpm --import http://linuxsoft.cern.ch/cern/slc6X/i386/RPM-GPG-KEY-cern
  +sudo wget -O /etc/yum.repos.d/slc6-devtoolset.repo http://linuxsoft.cern.ch/cern/devtoolset/slc6-devtoolset.repo
  sudo yum install devtoolset-2-gcc-c++ devtoolset-2-binutils</pre>
  Set the following variable before you build:
  <pre class="prettyprint lang-sh"
  