Tests fail when using Go 1.14

[nkryuchkov]

Describe the bug

fatal error: checkptr: unsafe pointer conversion

goroutine 10272 [running]:
runtime.throw(0xbcf2ac, 0x23)
	/usr/lib/go/src/runtime/panic.go:1112 +0x72 fp=0xc00072a868 sp=0xc00072a838 pc=0x463282
runtime.checkptrAlignment(0xc000027570, 0xb7f700, 0x1)
	/usr/lib/go/src/runtime/checkptr.go:18 +0xb7 fp=0xc00072a898 sp=0xc00072a868 pc=0x434747
go.etcd.io/bbolt.(*Bucket).write(0xc00072aa10, 0x0, 0x0, 0x0)
	/home/evanlinjin/go/pkg/mod/go.etcd.io/bbolt@v1.3.3/bucket.go:624 +0x15c fp=0xc00072a900 sp=0xc00072a898 pc=0xa5f81c
go.etcd.io/bbolt.(*Bucket).CreateBucket(0xc00009a7f8, 0xc0002382b8, 0x3, 0x8, 0xc00072aac8, 0xa685a4, 0x0)
	/home/evanlinjin/go/pkg/mod/go.etcd.io/bbolt@v1.3.3/bucket.go:181 +0x465 fp=0xc00072aac0 sp=0xc00072a900 pc=0xa5bc65
go.etcd.io/bbolt.(*Bucket).CreateBucketIfNotExists(0xc00009a7f8, 0xc0002382b8, 0x3, 0x8, 0xc00072ab90, 0xa68009, 0xc000374000)
	/home/evanlinjin/go/pkg/mod/go.etcd.io/bbolt@v1.3.3/bucket.go:199 +0x5e fp=0xc00072ab28 sp=0xc00072aac0 pc=0xa5c00e
go.etcd.io/bbolt.(*Tx).CreateBucketIfNotExists(...)
	/home/evanlinjin/go/pkg/mod/go.etcd.io/bbolt@v1.3.3/tx.go:115
github.com/SkycoinProject/skywire-mainnet/pkg/app.newBoltDB.func2(0xc00009a7e0, 0xc000374101, 0xc00009a7e0)
	/home/evanlinjin/git/skywire-mainnet/pkg/app/log_store.go:55 +0x80 fp=0xc00072aba0 sp=0xc00072ab28 pc=0xa9f500
go.etcd.io/bbolt.(*DB).Update(0xc000374000, 0xc00072ad18, 0x0, 0x0)
	/home/evanlinjin/go/pkg/mod/go.etcd.io/bbolt@v1.3.3/db.go:694 +0xec fp=0xc00072ac48 sp=0xc00072aba0 pc=0xa6988c
github.com/SkycoinProject/skywire-mainnet/pkg/app.newBoltDB(0xc000027500, 0x15, 0xbbbddb, 0x3, 0x0, 0x0, 0x0, 0x0)
	/home/evanlinjin/git/skywire-mainnet/pkg/app/log_store.go:54 +0x1e4 fp=0xc00072ad48 sp=0xc00072ac48 pc=0xa8e474
github.com/SkycoinProject/skywire-mainnet/pkg/app.TestLogStore(0xc000262000)
	/home/evanlinjin/git/skywire-mainnet/pkg/app/log_store_test.go:19 +0x179 fp=0xc00072aed0 sp=0xc00072ad48 pc=0xa99a29
testing.tRunner(0xc000262000, 0xbe1c10)
	/usr/lib/go/src/testing/testing.go:992 +0x1ec fp=0xc00072afd0 sp=0xc00072aed0 pc=0x5aad4c
runtime.goexit()
	/usr/lib/go/src/runtime/asm_amd64.s:1373 +0x1 fp=0xc00072afd8 sp=0xc00072afd0 pc=0x496c31
created by testing.(*T).Run
	/usr/lib/go/src/testing/testing.go:1043 +0x661

Environment information:

• OS: Mac OS X
• Go: 1.14

Steps to Reproduce
Steps to reproduce the behavior:

1. Update Go to 1.14
2. Run make check

Actual behavior
Tests fail.

Expected behavior
Tests pass.

[nkryuchkov]

The failure happens inside bbolt (https://github.com/etcd-io/bbolt/blob/v1.3.3/bucket.go#L624). Go 1.14 compiler adds a new checkptr debug flag which is enabled by default when using the -race flag (https://golang.org/doc/go1.14#compiler), which breaks bbolt.

There's a pull request in bbolt with a fix: etcd-io/bbolt#201. Until it's merged we can use a temporary workaround and pass the -gcflags=all=-d=checkptr=0 flag to tests along with the -race flag.

After the PR in bbolt is merged, the workaround should be removed and the bbolt version should be updated.

[jdknives]

Fixed by above PRs.