Rise up allocated memory of fuel master node for virtual envs in order
to avoid swapping and improve performance of overall deployment process.
Change-Id: I04b020b628a9c84f934a9d17e8be98d34fe2a085
Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>
(cherry picked from commit 
c382da389e0dcffe48c428695f4b29c1c6151bd4)
 <domain type='kvm'>
   <name>fuel</name>
-  <memory unit='KiB'>2097152</memory>
-  <currentMemory unit='KiB'>2097152</currentMemory>
+  <memory unit='KiB'>4194304</memory>
+  <currentMemory unit='KiB'>4194304</currentMemory>
   <vcpu placement='static'>2</vcpu>
   <resource>
     <partition>/machine</partition>