Change SMPP default enquireLinkTimer from 5 seconds to 60 seconds.

[pmoerenhout]

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Change the default SMPP enquireLinkTime from 5 to 60 seconds. The default of 5 seconds is too aggressive for default connections not specifying an other value.

[oscerd]

LGTM but there is no JIRA issue about this change.

[pmoerenhout]

I can create the Jira, no problem, I also see that the sourcecheck failed on the imports. Will redo the PR...

[oscerd]

The sourcecheck is failing for another commit, the jira is not really needed, I was noticiing this because you marked the first point of PR template

[PascalSchumacher]

+1, at work we also changed it to 60 seconds years ago, because the SMSC colleagues complained about the 5 second interval.