Fix of fake unlogged LSN initialization

Hello,


The attached trivial patch fixes the initialization of the fake unlogged LSN.  Currently, BootstrapXLOG() in initdb
setsthe initial fake unlogged LSN to FirstNormalUnloggedLSN (=1000), but the recovery and pg_resetwal sets it to 1.
Thepatch modifies the latter two cases to match initdb. 

I don't know if this do actual harm, because the description of FirstNormalUnloggedLSN doesn't give me any idea.


Regards
Takayuki Tsunakawa