RFR: 8258833: Cancel multi-part cipher operations in SunPKCS11 after failures [v7]

[Martin Balao]

> When a multi-part cipher operation fails in SunPKCS11 (i.e. because of an invalid block size), we now cancel the operation before returning the underlying Session to the Session Manager. This allows to use the returned Session for a different purpose. Otherwise, an CKR_OPERATION_ACTIVE error would be raised from the PKCS#11 library.
> 
> The jdk/sun/security/pkcs11/Cipher/CancelMultipart.java regression test is introduced as part of this PR.
> 
> No regressions found in jdk/sun/security/pkcs11.

Martin Balao has updated the pull request incrementally with two additional commits since the last revision:

 - Align doCancel pattern in 'P11Cipher::implDoFinal(byte[]..' to 'P11Cipher::implDoFinal(ByteBuffer..'. Better documentation in P11Cipher. Copyright date updated.
 - Copyright dates updated to 2021 on modified files

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1901/files
  - new: https://git.openjdk.java.net/jdk/pull/1901/files/4c892a44..bb52a064

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1901&range=06
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1901&range=05-06

  Stats: 40 lines in 6 files changed: 31 ins; 3 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1901.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1901/head:pull/1901

PR: https://git.openjdk.java.net/jdk/pull/1901