Recommended update for purge-kernels-service

This update for purge-kernels-service fixes the following issues:

- Add 'ZYPP_LOCK_TIMEOUT=-1' to keep waiting for the lock to avoid possible conflict with other background services uding zypper. (bsc#1184399)

This update was imported from the SUSE:SLE-15-SP2:Update update project.

Fixed bugs
bnc#1184399
purge-kernels.service might conflict with other background services using zypper as well
Selected Binaries
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