[stable10] Updating phpunit/phpunit (5.7.27 => 6.5.14)

[phil-davis]

Backport #34860

1. Bump phpunit 5.7 to 6.5 in composer.json
2. Adjust setExpectedException becomes expectException
3. Adjust PHP unit framework namespace - e.g. PHPUnit_Framework_Assert becomes PHPUnit\Framework\Assert
4. Adjust PHPunit framework references in encryption unit tests
5. Adjust PHPunit framework references in encryption acceptance tests
6. Adjust PHPunit framework references in user management acceptance tests

Note: encryption and user_management are still part of stable10. So these have to be adjusted in the backport, but were not in master.

https://github.com/sebastianbergmann/phpunit/wiki/Release-Announcement-for-PHPUnit-6.0.0

Note: app repo unit tests use the phpunit from core. When this (and master #34860 ) are merged, then app repo tests also have to be adjusted for PHPUnit6. The changes are not difficult - see points (2) and (3) above. But still it will have to be done.

[codecov]

Codecov Report

Merging #34866 into stable10 will decrease coverage by 0.03%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             stable10   #34866      +/-   ##
==============================================
- Coverage       64.23%   64.19%   -0.04%     
+ Complexity      19905    19902       -3     
==============================================
  Files            1277     1277              
  Lines           76277    76343      +66     
  Branches         1292     1292              
==============================================
+ Hits            48993    49009      +16     
- Misses          26905    26955      +50     
  Partials          379      379

Flag	Coverage Δ	Complexity Δ
#javascript	53.2% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.35% <ø> (-0.04%)	19902 <ø> (-3)

Impacted Files	Coverage Δ	Complexity Δ
...s/comments/tests/unit/Dav/EntityCollectionTest.php	100% <ø> (ø)	8 <0> (ø)	⬇️
...pps/comments/tests/unit/Dav/RootCollectionTest.php	98.38% <ø> (ø)	18 <0> (ø)	⬇️
...mments/tests/unit/Dav/EntityTypeCollectionTest.php	100% <ø> (ø)	7 <0> (ø)	⬇️
tests/bootstrap.php	0% <ø> (ø)	0 <0> (ø)	⬇️
apps/encryption/lib/Crypto/EncryptAll.php	83.41% <0%> (-9.96%)	46% <0%> (ø)
apps/dav/lib/CardDAV/SyncService.php	45.04% <0%> (-2.58%)	27% <0%> (ø)
lib/private/Repair/MoveAvatarOutsideHome.php	35.55% <0%> (-1.95%)	12% <0%> (ø)
apps/files_trashbin/lib/Expiration.php	96.55% <0%> (-1.73%)	29% <0%> (ø)
apps/dav/lib/DAV/PublicAuth.php	16.66% <0%> (-1.52%)	5% <0%> (ø)
lib/private/Security/CertificateManager.php	87.91% <0%> (-0.98%)	36% <0%> (ø)
... and 29 more

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[PVince81]

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