Updating metadata salvage csuite test to handle salvaging table metadata without salvaging file metadata

verify_metadata/291: wt_session->open_cursor(wt_session, t->name, NULL, NULL, &cursor): No such file or directory

(gdb) bt

#0  0x00007f6c3df5893f in raise () from /lib64/libc.so.6

#1  0x00007f6c3df42c95 in abort () from /lib64/libc.so.6

#2  0x000000000041dc2e in testutil_die (e=2, fmt=fmt@entry=0x60637c "%s/%d: %s")

    at ../../../test/utility/misc.c:72

#3  0x000000000041d273 in verify_metadata (conn=<optimized out>, tables=tables@entry=0x7ffd83ca4b20)

    at ../../../test/csuite/wt4156_metadata_salvage/main.c:293

#4  0x000000000041d8c2 in open_with_salvage (table_data=table_data@entry=0x7ffd83ca4b20, sfx=0x0)

    at ../../../test/csuite/wt4156_metadata_salvage/main.c:395

#5  0x000000000041ccf7 in run_all_verification (sfx=0x0, t=0x7ffd83ca4b20)

    at ../../../test/csuite/wt4156_metadata_salvage/main.c:419

#6  main (argc=<optimized out>, argv=<optimized out>)

    at ../../../test/csuite/wt4156_metadata_salvage/main.c:485