Fix installing 3.13 kernel and other packages

* Added explicit installing 3.13 kernel in postinstall section
  because we use several different repositories and
  if we upgrade a node installer tries to
  find kernel only in one of them.
* Added 'yum update' and 'apt-get upgrade'
  to make sure all packages are up to date

Closes-Bug: 1399205
Change-Id: I12742735311f5d49f92d3dde845c15262e9f8372
Merge "Fix installing 3.13 kernel and other packages"