fix(badger): release/v20.03- Update badger to v20.07.0-rc1 (#5941)

* Update badger to v20.07.0-rc1

This commit brings following new changes from badger
This commit also disable conflict detection in badger to save memory.

```
Fix assert in background compression and encryption. (hypermodeinc/badger#1366)
Avoid panic in filltables() (hypermodeinc/badger#1365)
Force KeepL0InMemory to be true when InMemory is true (hypermodeinc/badger#1375)
Tests: Use t.Parallel in TestIteratePrefix tests (hypermodeinc/badger#1377)
Remove second initialization of writech in Open (hypermodeinc/badger#1382)
Increase default valueThreshold from 32B to 1KB (hypermodeinc/badger#1346)
pre allocate cache key for the block cache and the bloom filter cache (hypermodeinc/badger#1371)
Rework DB.DropPrefix (hypermodeinc/badger#1381)
Update head while replaying value log (hypermodeinc/badger#1372)
Update ristretto to commit f66de99 (hypermodeinc/badger#1391)
Enable cross-compiled 32bit tests on TravisCI (hypermodeinc/badger#1392)
Avoid panic on multiple closer.Signal calls (hypermodeinc/badger#1401)
Add a contribution guide (hypermodeinc/badger#1379)
add assert to check integer overflow for table size (hypermodeinc/badger#1402)
return error if the vlog writes exceeds more that 4GB. (hypermodeinc/badger#1400)
Revert "add assert to check integer overflow for table size (hypermodeinc/badger#1402)" (hypermodeinc/badger#1406)
Revert "fix: Fix race condition in block.incRef (hypermodeinc/badger#1337)" (hypermodeinc/badger#1407)
Revert "Buffer pool for decompression (hypermodeinc/badger#1308)" (hypermodeinc/badger#1408)
Revert "Compress/Encrypt Blocks in the background (hypermodeinc/badger#1227)" (hypermodeinc/badger#1409)
Add missing changelog for v2.0.3 (hypermodeinc/badger#1410)
Changelog for v20.07.0 (hypermodeinc/badger#1411)
```

* Remove unnecessary detect conflicts

go.mod

@@ -16,9 +16,9 @@ require (
 	github.com/blevesearch/segment v0.0.0-20160915185041-762005e7a34f // indirect
 	github.com/blevesearch/snowballstem v0.0.0-20180110192139-26b06a2c243d // indirect
 	github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd
-	github.com/dgraph-io/badger/v2 v2.0.1-rc1.0.20200617052219-dd332b04e6e7
+	github.com/dgraph-io/badger/v2 v2.0.1-rc1.0.20200711090415-0dfb8b45d4a4
 	github.com/dgraph-io/dgo/v2 v2.2.1-0.20200319183917-53c7d5bc32a7
-	github.com/dgraph-io/ristretto v0.0.2-0.20200115201040-8f368f2f2ab3
+	github.com/dgraph-io/ristretto v0.0.3-0.20200630154024-f66de99634de
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/dgryski/go-farm v0.0.0-20200201041132-a6ae2369ad13
 	github.com/dgryski/go-groupvarint v0.0.0-20190318181831-5ce5df8ca4e1

go.sum

@@ -76,12 +76,12 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgraph-io/badger v1.6.0 h1:DshxFxZWXUcO0xX476VJC07Xsr6ZCBVRHKZ93Oh7Evo=
 github.com/dgraph-io/badger v1.6.0/go.mod h1:zwt7syl517jmP8s94KqSxTlM6IMsdhYy6psNgSztDR4=
-github.com/dgraph-io/badger/v2 v2.0.1-rc1.0.20200617052219-dd332b04e6e7 h1:DGnkUbdu48x8SgVR3bENgKQKGwxIKZJ7RYNVFrpqcn0=
-github.com/dgraph-io/badger/v2 v2.0.1-rc1.0.20200617052219-dd332b04e6e7/go.mod h1:3KY8+bsP8wI0OEnQJAKpd4wIJW/Mm32yw2j/9FUVnIM=
+github.com/dgraph-io/badger/v2 v2.0.1-rc1.0.20200711090415-0dfb8b45d4a4 h1:M85aROJxDOXmp8mZQN6x04EraKDGOF2RL3ox/6LZdjo=
+github.com/dgraph-io/badger/v2 v2.0.1-rc1.0.20200711090415-0dfb8b45d4a4/go.mod h1:26P/7fbL4kUZVEVKLAKXkBXKOydDmM2p1e+NhhnBCAE=
 github.com/dgraph-io/dgo/v2 v2.2.1-0.20200319183917-53c7d5bc32a7 h1:9oFXHEReyRIB291rbdGwRk1PYegGO2XBtZ8muXPKqPA=
 github.com/dgraph-io/dgo/v2 v2.2.1-0.20200319183917-53c7d5bc32a7/go.mod h1:LJCkLxm5fUMcU+yb8gHFjHt7ChgNuz3YnQQ6MQkmscI=
-github.com/dgraph-io/ristretto v0.0.2-0.20200115201040-8f368f2f2ab3 h1:MQLRM35Pp0yAyBYksjbj1nZI/w6eyRY/mWoM1sFf4kU=
-github.com/dgraph-io/ristretto v0.0.2-0.20200115201040-8f368f2f2ab3/go.mod h1:KPxhHT9ZxKefz+PCeOGsrHpl1qZ7i70dGTu2u+Ahh6E=
+github.com/dgraph-io/ristretto v0.0.3-0.20200630154024-f66de99634de h1:t0UHb5vdojIDUqktM6+xJAfScFBsVpXZmqC9dsgJmeA=
+github.com/dgraph-io/ristretto v0.0.3-0.20200630154024-f66de99634de/go.mod h1:KPxhHT9ZxKefz+PCeOGsrHpl1qZ7i70dGTu2u+Ahh6E=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
 github.com/dgryski/go-farm v0.0.0-20190423205320-6a90982ecee2/go.mod h1:SqUrOPUnsFjfmXRMNPybcSiG0BgUW2AuFH8PAnS2iTw=