WIP: xtrabackup implementation + allow_master#4614

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deepthi wants to merge 5 commits intovitessio:masterfrom

planetscale:ds-xtrabackup-allow-master

Commits on Feb 12, 2019

refactor backup/restore to allow plugging in external backup engines. first pass at implementing xtrabackup. add allow_master option to vtctl backup commands
deepthi
committed
backup engine interface, builtin and xtrabackup implementations
deepthi
committed

Commits on Feb 15, 2019

clean up allow_master implementation, implement xtrabackup restore
deepthi
committed

Commits on Feb 28, 2019

basic working testcases for xtrabackup. replace use of golang tar library with execCommand because xtrabackup's tar file format is weird
deepthi
committed

Commits on Mar 2, 2019

test and fix xbstream mode, handle tar mode without intermediate file
deepthi
committed