Recommended update for python-rtslib

This update for python-rtslib provides the following fixes:

- Allow WWN validation for fc_wwn transport. (bsc#975051)
- Disallow upper-case IQN names. (bsc#968745)

This update was imported from the SUSE:SLE-12:Update update project.

Fixed bugs
bnc#968745
targetcli can create targets with uppercase letters causing lio-utils problems
bnc#975051
ConfigError: Unknown value type 'fc_wwn' when validating
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