update constraint for oslo.rootwrap to new release 5.12.1

Change-Id: I373c436ab78a1ea52a5dcac74165723714d2373a
meta:version: 5.12.1
meta:diff-start: -
meta:series: queens
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: ChangBo Guo(gcb) <eric.guo@easystack.cn>
meta:release:Commit: ChangBo Guo(gcb) <eric.guo@easystack.cn>
meta:release:Change-Id: I26c7935d7c812e89af16f0d6ae11bd1bef13161f
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>

upper-constraints.txt

@@ -392,7 +392,7 @@ stevedore===1.28.0
 botocore===1.8.7
 xmltodict===0.11.0
 pyasn1===0.4.2
-oslo.rootwrap===5.12.0
+oslo.rootwrap===5.12.1
 Django===1.11.8
 pexpect===4.3.0
 cmd2===0.7.8