dbmirror had sprintf string too short

I have just applied a patch to 7.3 and current CVS to properly allocate
an sprintf string in dbmirror:
       fullyqualtblname = SPI_palloc(strlen(tblname) +                          strlen(schemaname) + 6);       sprintf(fullyqualtblname,"\"%s\".\"%s\"",           schemaname,tblname);

Old code had 4 instead of 6.  Tatsuo found this bug.

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