[BUG] global end does not work

[ryanfaircloth]

Describe the bug
eventgen does not stop after "end" as occurred when end is int

To Reproduce
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2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Actual behavior
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Screenshots
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Sample files and eventgen.conf file
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Do you run eventgen with SA-eventgen?
Yes/No(No means you run eventgen with pip module mode)

If you are using SA-Eventgen with Splunk (please complete the following information):

• OS: [e.g. Windows/Mac OS 10.14]
• Browser [e.g. chrome, safari]
• Eventgen Version [e.g. 22]
• Splunk Version[e.g. 7.1.3]
• What other apps you have installed in Splunk etc/apps?

If you are using eventgen with pip module mode (please complete the following information):

• python version: [e.g. 2.6]
• OS: [e.g. Windows10]
• Virtual Env is used: Yes/No
• Eventgen Version [e.g. 6.3.2]

Additional context
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