test/format cache stuck full

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#  RUN PARAMETERS

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abort=0

auto_throttle=0

firstfit=0

bitcnt=2

bloom=1

bloom_bit_count=35

bloom_hash_count=20

bloom_oldest=0

cache=8

checkpoints=1

checksum=uncompressed

chunk_size=2

compaction=0

compression=lz4

data_extend=1

data_source=file

delete_pct=4

dictionary=0

encryption=none

evict_max=5

file_type=row-store

backups=0

huffman_key=0

huffman_value=0

insert_pct=28

internal_key_truncation=1

internal_page_max=17

isolation=read-committed

key_gap=7

key_max=63

key_min=17

leak_memory=0

leaf_page_max=12

logging=0

logging_compression=zlib

logging_archive=0

logging_prealloc=1

long_running_txn=0

lsm_worker_threads=4

merge_max=18

mmap=1

ops=100000

prefix_compression=1

prefix_compression_min=2

repeat_data_pct=80

reverse=0

rows=100000

runs=1

salvage=1

split_pct=52

statistics=0

statistics_server=0

threads=8

timer=20

value_max=753

value_min=3

verify=1

wiredtiger_config=

write_pct=88

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