BIGTOP-3705: Refine the Ambari RPM spec to fix warning after rpm uninstallation (#914)
BIGTOP-3705: Refine the Ambari RPM spec to fix warning after rpm uninstallation (#914)

Duplicated deleting operation ('%files' and '%preun%') in Ambari RPM spec
makes some warning issues when uninstalling Ambari rpm.
And '%config' in spec would create 'xxx.rpmsave' which was no longer needed.

Change-Id: Ic0f8a469ce69641e0482a3c7fcc259bd56f33c40
Signed-off-by: Yuqi Gu <345a4e3af047c06b177f7fe1915a45f6033d9349@arm.com>
apache/bigtop,apache/bigtop,apache/bigtop,apache/bigtop,apache/bigtop