Prevent pg_enable/disable_data_checksums() on standby

These functions missed a RecoveryInProgress() check, allowing them to
be called on a hot standby.  Enabling, or disabling, checksums on the
standby only would cause the cluster to get out of sync and replaying
checksum transitions to fail.

Author: Satyanarayana Narlapuram <[email protected]>
Reviewed-by: Ayush Tiwari <[email protected]>
Reviewed-by: Tomas Vondra <[email protected]>
Reviewed-by: Daniel Gustafsson <[email protected]>
Discussion: 
https://postgr.es/m/CAHg+QDfRk4-S7DMmdbXJnQ-xF=supmakuh8b83oblqyvkx5...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/b120358c612dce62b493da7682b4df90a10783c9

Modified Files
--------------
src/backend/postmaster/datachecksum_state.c | 4 ++++
1 file changed, 4 insertions(+)

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