Fix pg_basebackup for keepalive messages

Teach pg_basebackup in streaming mode to deal with keepalive messages.
Also change the order of checks to complain at the message rather than
block size when a new message is introduced.

In passing, switch to using sizeof() instead of hardcoded sizes for
WAL protocol structs.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/6b020d228b976821181ac673964f302b2c32f12d

Modified Files
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src/bin/pg_basebackup/receivelog.c |   30 +++++++++++++++++++++++-------
1 files changed, 23 insertions(+), 7 deletions(-)

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