Sync file system before crash
Sync file system before crash

In Crashdump test, perform sync file system before it crash the host.

xenserver/auto-cert-kit,xenserver/auto-cert-kit,vivekkumac/auto-cert-kit,vivekkumac/auto-cert-kit,bpwook/auto-cert-kit,rdobson/auto-cert-kit,rdobson/auto-cert-kit,bpwook/auto-cert-kit