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ksal_zstd

This release enables the KSAL zstd algorithm.
The KSAL is developed by Huawei. It contains the EC, CRC16 T10DIF, CRC32C and KSAL zstd algorithms.
Based on the Huawei-developed Kunpeng affinity-oriented codec acceleration strategy, KSAL zstd achieved better performance compared with open source zstd in designated level.
1. Obtain full zstd dynamic library:
(1) Depends:
It is based on zstd-1.5.6 version. To get libzstd.so dynamic library, please download the open source code from:
https://github.com/facebook/zstd/releases/download/v1.5.6/zstd-1.5.6.tar.gz
It is based on libksal-release-1.10.0.oe1.aarch64.rpm. Please download from kunpeng community.
(2) The patch for zstd is ksal-zstd.patch
Download libksal-release-1.10.0.oe1.aarch64.rpm, Makefile, ksal-zstd.patch, ksal_zstd.spec, libksal_zstd_so_create.sh and put them in same package with zstd-1.5.6.tar.gz.
execute 'sh libksal_zstd_so_create.sh' and we can get final ksal_zstd-1.0.0-openEuler.aarch64.rpm in rpmbuild/RPMS/aarch64/.
(Notice: Before this, rpmbuild is needed to be installed.)
(3) About Installing and Uninstalling:
Use command 'rpm -ivh ksal_zstd-1.0.0-openEuler.aarch64.rpm' to install libzstd.so, which is placed in '/usr/ksal_zstd/'
Use command 'rpm -e ksal_zstd-1.0.0-openEuler.aarch64' to uninstall.
2. About enabling Ceph: 
(1) It is based on Ceph v14.2.8. Download the open source code from:
https://download.ceph.com/tarballs/ceph-14.2.8.tar.gz
(2) The patch for ceph is ceph-ksal-zstd-plugin.patch.
Download ceph-ksal-zstd-plugin.patch, and incorporate it into ceph-14.2.8 by running 'patch -p1 < ceph-ksal-zstd-plugin.patch'.
After the incorporation is complete, compile the Ceph RPM installation package.