tests/config: integration tests for chunker

Recommended `rclone.conf` snippets for this `config.yaml`:
```
[TestChunkerLocal]
type = chunker
meta_format = simplejson
remote = /tmp/rclone-chunker-test

[TestChunkerChunk3bLocal]
type = chunker
chunk_size = 3b
meta_format = simplejson
remote = /tmp/rclone-chunker-test

[TestChunkerNometaLocal]
type = chunker
meta_format = none
remote = /tmp/rclone-chunker-test

[TestChunkerChunk3bNometaLocal]
type = chunker
chunk_size = 3b
meta_format = none
remote = /tmp/rclone-chunker-test

[TestChunkerCompatLocal]
type = chunker
meta_format = wdmrcompat
remote = /tmp/rclone-chunker-test
```

fstest/test_all/config.yaml

@@ -26,6 +26,71 @@ backends:
  - backend:  "crypt"
    remote:   "TestCryptSwift:"
    fastlist: false
+ ## chunker
+ - backend:  "chunker"
+   remote:   "TestChunkerLocal:"
+   fastlist: true
+ - backend:  "chunker"
+   remote:   "TestChunkerNometaLocal:"
+   fastlist: true
+ - backend:  "chunker"
+   remote:   "TestChunkerCompatLocal:"
+   fastlist: true
+ - backend:  "chunker"
+   remote:   "TestChunkerChunk3bLocal:"
+   fastlist: true
+   maxfile:  6k
+ - backend:  "chunker"
+   remote:   "TestChunkerChunk3bNometaLocal:"
+   fastlist: true
+   maxfile:  6k
+ - backend:  "chunker"
+   remote:   "TestChunkerChunk3bCompatLocal:"
+   fastlist: true
+   maxfile:  6k
+ - backend:  "chunker"
+   remote:   "TestChunkerMailru:"
+   fastlist: true
+ - backend:  "chunker"
+   remote:   "TestChunkerChunk50bMailru:"
+   fastlist: true
+   maxfile:  10k
+ - backend:  "chunker"
+   remote:   "TestChunkerChunk50bYandex:"
+   fastlist: true
+   maxfile:  1k
+ - backend:  "chunker"
+   remote:   "TestChunkerChunk50bBox:"
+   fastlist: true
+   maxfile:  1k
+ - backend:  "chunker"
+   remote:   "TestChunkerS3:"
+   fastlist: true
+   ignore:
+     - TestIntegration/FsMkdir/FsPutFiles/SetTier
+ - backend:  "chunker"
+   remote:   "TestChunkerChunk50bS3:"
+   fastlist: true
+   maxfile:  1k
+   ignore:
+     - TestIntegration/FsMkdir/FsPutFiles/SetTier
+ #- backend:  "chunker"
+ #  remote:   "TestChunkerChunk50bMD5HashS3:"
+ #  fastlist: true
+ #  maxfile:  1k
+ #- backend:  "chunker"
+ #  remote:   "TestChunkerChunk50bMD5QuickS3:"
+ #  fastlist: true
+ #  maxfile:  1k
+ #- backend:  "chunker"
+ #  remote:   "TestChunkerChunk50bSHA1HashS3:"
+ #  fastlist: true
+ #  maxfile:  1k
+ #- backend:  "chunker"
+ #  remote:   "TestChunkerChunk50bSHA1QuickS3:"
+ #  fastlist: true
+ #  maxfile:  1k
+ ## end chunker
  - backend:  "drive"
    remote:   "TestDrive:"
    fastlist: true