Archive-get fails to apply partial compressed WAL segments produced by pg_receivewal

[kuzmindb]

Archive-get fails to apply partial compressed WAL segments produced by pg_receivewal if it was manually renamed.

pg_probackup version: 2.2.5

Log on restored server:

INFO: pg_probackup archive-get from /backup/wal/master1/0000000100000000000000B5 to /var/lib/pgpro/std-11/data/pg_wal/RECOVERYXLOG
INFO: pg_probackup archive-get completed successfully
2020-03-03 16:57:13.146 +10 [1675] FATAL: archive file "0000000100000000000000B5" has wrong size: 5376304 instead of 16777216
2020-03-03 16:57:13.149 +10 [1673] LOG: startup process (PID 1675) exited with exit code 1
2020-03-03 16:57:13.149 +10 [1673] LOG: terminating any other active server processes
2020-03-03 16:57:13.164 +10 [1673] LOG: database system is shut down

[gsmolk]

Done in 64a90db
#185