scripts/generate-iscsi-iqn: Update the inline Python script for Py3

[bernhardkaindl]

Hi @psafont and @ashwin9390,

Sinlge-line fix for Python3 support in https://github.com/xenserver-next/xen-api/blob/feature/py3/scripts/generate-iscsi-iqn

- if __name__ == "__main__": print f(sys.argv[1])
+ if __name__ == "__main__": print(f(sys.argv[1]))

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TL;DR

By visual inspection of the shell script
https://github.com/xenserver-next/xen-api/blob/feature/py3/scripts/generate-iscsi-iqn
(that runs an inline python script), I saw a remaining print statement, that needs to be a function:

BTW: The inline Python script is used to reverse a domain name for the shell script:

arg: www.name.com
ret: com.name.www 

PS: I guess that's something special for iSCSI (not related: DNS has the same of reverse DNS).

PPS: That could likely be done in the shell itself, but since that's in a large loop (I guess) it shouldn't be a performance issue to call PYthon for reversing the domain name.

I tested the resulting shell script to successfully reverse the domain name with Python3 too.

Link to the commit: scripts/generate-iscsi-iqn: Fix inline Python to work in Py3