RFR: 7348: JMC preference options are duplicated [v2]

[Guru Hb]

> "General" , "Appearance" and "Keys" had duplicate entry . This was due to some in consistence "org.eclipse.ui.*" Components were used (one with older + latest version which is causing duplicate entry). 
> 
> Solution : adding "resolution:=optional" resolves the duplicate entry. ~~Restricted the Eclipse UI components to v3.2.0 and less than equal to 4.0.0.~~

Guru Hb has updated the pull request incrementally with one additional commit since the last revision:

  Removing required-bundle which is redundent

-------------

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/289/files
  - new: https://git.openjdk.java.net/jmc/pull/289/files/44bfb25e..ffb3ebc1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=289&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=289&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jmc/pull/289.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/289/head:pull/289

PR: https://git.openjdk.java.net/jmc/pull/289