openEuler 21.03 2021/4/1 release

openEuler 21.03版本作为2021年首个创新版本，发布范围主要如下：
1、内核版本升级到5.10
2、新增组件OpenStack/xfce/Kubernetes
3、竞争力特性：StratoVirt轻量级虚拟化功能增强和优化/etmem/内核热升级/secGear机密计算安全应用开发套件
4、删除python2
5、补齐/优化社区软件包生态
6、修复bug和cve

本次版本需求特性：
详见：https://gitee.com/openeuler/release-management/blob/master/openEuler-21.03/release-plan.md
no	fetur	
1	openEuler 21.03 support openStack	
2	openEuler 21.03 support virtualization live migration pro	
3	openEuler 21.03 support StratoVirt function enhancement
4	openEuler 21.03 support Risc-v virt live migration
5	openEuler 21.03 support DDE	
6	openEuler 21.03 kernel update to version 5.10
7	openEuler 21.03 remove python 2 from release	
8	openEuler 21.03 support xfce 4.14	
9	openEuler 21.03 support memig		
10	openEuler 21.03 support nvwa	
11	openEuler 21.03 support secGear	
12	openEuler 21.03 support RaspberryPi	
13	openEuler 21.03 support UKUI	
14	openEuler 21.03 support HA	
15	openEuler 21.03 support StratoVirt microvm image
16	openEuler 21.03 support Kubernetes	
17	openEuler 21.03 update SPDK	
28	openEuler 21.03 update some software	
29	openEuler 21.03 slim container base image
	
openEuler 21.03版本共发现问题单266个，有效问题253个，其中修复问题单247个，回归均通过，另外转需求问题单2个，遗留问题单6个，遗留问题详见链接测试报告：
https://gitee.com/openeuler/QA/blob/master/Test_Result/openEuler_21.03/openEuler%2021.03%E7%89%88%E6%9C%AC%E6%B5%8B%E8%AF%95%E6%8A%A5%E5%91%8A.md

本次版本修复cve 743个。

openEuler/release-management

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