Ignore auto-generated files by lintstack

Part of blueprint lintstack

Change-Id: I6ca0ec71c7fa083a86920a7ae055ef8e9d19c512
Run_as_root to ensure resize2fs succeed for all image backends

Unlike other file based image backend, operation over LVM
logical volumes requires root to functioning correctly. Resize2fs
on logical volumes also need run_as_root.

Otherwise, when running nova-compute as non-root user, instance
creation with flavor disk size larger than image size would fail.
Caused by resize2fs failure.

Fixes LP# 1101137

Change-Id: I16a2aa4382be58843270ff23e11bfb1e20c568d2
Merge "Run_as_root to ensure resize2fs succeed for all image backends"
Merge "Ignore auto-generated files by lintstack"