Recommended update for libzypp

This update for libzypp fixes the following issues:

- Add filesize check for downloads with known size (bsc#408814)
- Fix conversion of string and glob to regex when compiling queries
(bsc#1099982, bsc#939392, bsc#556664)
- Fix blocking wait for finished child process (bsc#1109877)

This update was imported from the SUSE:SLE-12-SP3:Update update project.

Fixed bugs
bnc#939392
zypper search ignores arguments with "+" (plus) characters
bnc#1109877
[Build 50.1] second stage stuck for more than an hour during installation
bnc#408814
VUL-1: libzypp: prevent downloads with infinite size
bnc#556664
zypper does not always find pattern devel_C_C++ with --match_exact
bnc#1099982
"zypper se" lists incorrectly with multiple packages when a "+" sign exist in package name
Selected Binaries
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