(MODULES-10023) Fix multiple xtrabackup regressions (#1245)
- fix xtrabackup target directory and related regressions
- fix handling of incremental backups with xtrabackup
- MODULES-10023 add parameter $incremental_backups to parent class
- MODULES-10023 add acceptance tests for xtrabackup
- MODULES-10023 add xtrabackup documentation
- MODULES-10023 fix acceptance tests
- MODULES-10023 fix xtrabackup tests on CentOS 6
- MODULES-10023 fix xtrabackup tests on Debian 8, Ubuntu 14.04, Scientific 6
- MODULES-10023 fix xtrabackup tests on SLES, RHEL 8 and RHEL/CentOS 5
- MODULES-10023 fix xtrabackup tests on RHEL/CentOS 5
- MODULES-10023 disable new xtrabackup tests on EOL operating systems
- (maint) exclude oracle6/centos6 platforms on running the feature tests
Co-authored-by: David Swan <david.swan@puppet.co.uk>
Co-authored-by: sheena <sheena@puppet.com>