RFR: 8260861: TrustStoreDescriptor log the same value

[Davin Kevin]

If both jssecacerts and cacerts are not defined, the same log is printed twice, talking about the jssecacerts instead of cacerts the second time. 

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Commit messages:
 - fix(truststore): log about truststore not found print everytime the same value

Changes: https://git.openjdk.java.net/jdk/pull/1690/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1690&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260861
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1690.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1690/head:pull/1690

PR: https://git.openjdk.java.net/jdk/pull/1690