Qualification tool: Add option to filter event logs for a maximum file system size

[tgravescs]

We have customers with TBs of event logs and some of them can be in the 100's of GB. Right now the qual tool needs as much memory as the uncompressed size. To allow for us to skip these add an option that skips event logs over a user specified size. Note this doesn't handle rolling event logs as it says in the option description below. I will file a followup to add that and add it to profiling tool.

The logic is first to filter by eventlog size and then by the file system time and number.
I also add a log info message to print the logs we filtered out.

Add a new option:

-m, --max-event-log-size  <arg>    Process only application event logs whose
                                    size is less than or equal to the size
                                    specified. Valid units of size are
                                    b(bytes),k(kilobytes),m(megabytes),g(gigabytes).
                                    If no units are specified, the size is
                                    assumed to be m. Note, this does not
                                    support event log rolling which puts
                                    multiple event logs for the same
                                    application into a single directory.

Testing was manual on some event logs and verified it only picked up ones <= to the size specified.

[tgravescs]

#1276 is followup

[nartal1]

Thanks @tgravescs ! LGTM.

[parthosa]

Thanks @tgravescs. LGTM