github.com/cockroachdb/cockroach/pkg/ccl/importccl: _semicolons_and_comments failed under stress

[cockroach-teamcity]

SHA: https://github.com/cockroachdb/cockroach/commits/f818c4c3b946c40839921c72fc1322fb3b385ee6

Parameters:

TAGS=
GOFLAGS=-race

Failed test: https://teamcity.cockroachdb.com/viewLog.html?buildId=772409&tab=buildLog

=== RUN   TestImportData/PGDUMP:_semicolons_and_comments
I180711 06:32:21.882772 207 storage/replica_proposal.go:203  [n1,s1,r48/1:/{Table/76-Max}] new range lease repl=(n1,s1):1 seq=3 start=1531290721.658934057,0 epo=1 pro=1531290721.660350222,0 following repl=(n1,s1):1 seq=3 start=1531290721.658934057,0 epo=1 pro=1531290721.660350222,0
I180711 06:32:22.191514 3120 ccl/importccl/read_import_proc.go:82  [import-distsql,n1] could not fetch file size; falling back to per-file progress: bad ContentLength: -1
I180711 06:32:22.380114 3219 ccl/importccl/read_import_proc.go:82  [import-distsql,n1] could not fetch file size; falling back to per-file progress: bad ContentLength: -1
I180711 06:32:22.793910 3207 storage/replica_command.go:275  [split,n1,s1,r49/1:/{Table/77-Max}] initiating a split of this range at key /Table/78 [r50]

[knz]

Dup #27360.

[knz]

Also #27498