HDDS-10556. Checkstyle summary excludes errors with xml

[adoroszlai]

What changes were proposed in this pull request?

summary.txt for checkstyle incorrectly removes failure message that matches the string xml, e.g. unused import from com.fasterxml.jackson.

checkstyle-errors.xml:

<file name="hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/shell/tenant/GetUserInfoHandler.java">
<error line="20" column="8" severity="error" message="Unused import - com.fasterxml.jackson.databind.ObjectMapper." source="com.puppycrawl.tools.checkstyle.checks.imports.UnusedImportsCheck"/>
</file>

summary.txt:

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/shell/tenant/GetUserInfoHandler.java

The problem is that <\?xml matches <xml or xml instead of <?xml as intended.

https://issues.apache.org/jira/browse/HDDS-10556

How was this patch tested?

Checked out ArafatKhan2198@9d4b3e5, ran checkstyle:

$ ./hadoop-ozone/dev-support/checks/checkstyle.sh
hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/shell/tenant/GetUserInfoHandler.java
 20: Unused import - com.fasterxml.jackson.databind.ObjectMapper.

[Galsza]

Thank you @adoroszlai for the patch LGTM+1

[myskov]

thanks for the patch @adoroszlai , LGTM

[adoroszlai]

Thanks @myskov for reviewing and merging this.