RFR: 8282884: Provide OID aliases for MD2, MD5, and OAEP

[Weijun Wang]

Add missing OID aliases for several algorithms.

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Commit messages:
 - 8282884: Provide OID aliases for MD2, MD5, and OAEP

Changes: https://git.openjdk.java.net/jdk/pull/7761/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7761&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282884
  Stats: 8 lines in 2 files changed: 2 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7761.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7761/head:pull/7761

PR: https://git.openjdk.java.net/jdk/pull/7761