lxc-oracle: fix warnings/errors from some rpm scriptlets
lxc-oracle: fix warnings/errors from some rpm scriptlets

- Some scriptlets expect fstab to exist so create it before doing the
  yum install

- Set the rootfs selinux label same as the hosts or else the PREIN script
  from initscripts will fail when running groupadd utmp, which prevents
  creation of OL4.x containers on hosts > OL6.x.

- Move creation of devices into a separate function

Signed-off-by: Dwight Engen <1793d65cf7b9eefb2bb8f5bee9a4b8ba782c26da@oracle.com>
Signed-off-by: Serge Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>

JohnPeacockMessageSystems/lxc,hkjolhede/lxc,federicobriata/lxc,jirislaby/lxc,hallyn/lxc,hkjolhede/lxc,efiop/lxc,cjwatson/lxc,lazy404/lxc,regit/lxc,bostjan/lxc,tych0/lxc,terceiro/lxc,akshaykarle/lxc,cjwatson/lxc,szaszg/lxc,szaszg/lxc,lazy404/lxc,ysbnim/lxc,armcc/lxc,bmoar/lxc,terceiro/lxc,DarknessBeforeDawn/lxc,ecarrara/lxc,caglar10ur/lxc,weizhenwei/lxc,akshaykarle/lxc,virajs/lxc,hfuCN/lxc,ysbnim/lxc,jirislaby/lxc,GreatFruitOmsk/lxc,yubo/lxc,DarknessBeforeDawn/lxc,regit/lxc,Ponce/lxc,QingweiPeterLan/cs188-lxc,ysbnim/lxc,fwilson42/lxc,raspberrypython/lxc,codebauss/lxc,caglar10ur/lxc,thmo/lxc,hkjolhede/lxc,aeris/lxc,rowhit/lxc,ss1h2a3tw/lxc,bmoar/lxc,christiaan/lxc,Distrotech/lxc,GreatFruitOmsk/lxc,ksperis/lxc,terceiro/lxc,rowhit/lxc,sapun/lxc,weizhenwei/lxc,DarknessBeforeDawn/lxc,raspberrypython/lxc,virajs/lxc,Distrotech/lxc,ecarrara/lxc,armcc/lxc,rowhit/lxc,virajs/lxc,federicobriata/lxc,ksperis/lxc,thmo/lxc,bmoar/lxc,Distrotech/lxc,rldleblanc/lxc,ioops/lxc,bostjan/lxc,ksperis/lxc,Ponce/lxc,rldleblanc/lxc,hallyn/lxc,efiop/lxc,sapun/lxc,regit/lxc,GreatFruitOmsk/lxc,aeris/lxc,Ponce/lxc,LynxChaus/lxc,ioops/lxc,major/lxc,major/lxc,hallyn/lxc,cjwatson/lxc,armcc/lxc,lisongmin/lxc,bostjan/lxc,thmo/lxc,fwilson42/lxc,QingweiPeterLan/cs188-lxc,weizhenwei/lxc,LynxChaus/lxc,codebauss/lxc,raspberrypython/lxc,Pelagicore/lxc,caglar10ur/lxc,jirislaby/lxc,rldleblanc/lxc,sapun/lxc,fwilson42/lxc,hfuCN/lxc,aeris/lxc,christiaan/lxc,ioops/lxc,akshaykarle/lxc,codebauss/lxc,ss1h2a3tw/lxc,QingweiPeterLan/cs188-lxc,LynxChaus/lxc,federicobriata/lxc,christiaan/lxc,JohnPeacockMessageSystems/lxc,ecarrara/lxc,hfuCN/lxc,Pelagicore/lxc,lisongmin/lxc,tych0/lxc,tych0/lxc,JohnPeacockMessageSystems/lxc,lisongmin/lxc,Pelagicore/lxc,major/lxc,ss1h2a3tw/lxc,yubo/lxc,efiop/lxc,yubo/lxc,lazy404/lxc,szaszg/lxc