[tor-bugs] #20546 [Metrics/CollecTor]: implement CleanUtils

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#20546: implement CleanUtils
-----------------------------------+--------------------
     Reporter:  iwakeh             |      Owner:
         Type:  enhancement        |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/CollecTor  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:  #20518
       Points:                     |   Reviewer:
      Sponsor:                     |
-----------------------------------+--------------------
 Create a `org.torproject.collector.persist.CleanUtils` class, which should
 offer the methods listed below.  First create the corresponding
 `org.torproject.collector.persist.CleanUtilsTest` class for all these
 methods.  After that make the tests pass.

 Use `Files.walkFileTree()` and `SimpleFileVisitor` for the implementation.

 1. Basic clean-up method:

 {{{
 #!java
 /**
  *  All files in the given directory and below are inspected and
  * erased, if they are older than the given cut-off-time.
 */
 public static void cleanDir(Path directory, long cutOffTime) {...}
 }}}

 2. Remove files with a certain ending:

 {{{
 #!java
 /**
  *  All files in the given directory and below are inspected and
  * erased, if they are older than the given cut-off-time, and their name
  * ends with one of the given patterns.
 */
 public static void cleanDirPattern(Path directory, long cutOffTime,
     String ... endingStrings) {...}
 }}}

 3. Some renaming methods:

 {{{
 #!java
 /**
  *  All files in the given directory and below are inspected and renamed
  * from <filename><ending> to <fileneame>, if their name ends with the
 given
  * 'ending'.
 */
 public static void renameFiles(Path directory, String ending) {...}


 /**
  *  All files in the given directory and below are inspected and renamed
  * from <filename>.tmp to <fileneame>, if their name ends with '.tmp'.
 */
 public static void renameTmpFiles(Path directory) {
   renameFiles(directory, ".tmp");
 }
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20546>
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