Recommended update for autoyast2

This update for autoyast2 fixes the following issues:

- Added missed flag "install_recommended" in software section. (bsc#990494)
- Check if AutoYaST "script" elements are hashes. Other entries will be ignored. (bsc#986049)
- Exporting NFS root partition correctly. (bsc#986124)

This update was imported from the SUSE:SLE-12-SP1:Update update project.

Fixed bugs
YaST2 autoyast creates reference profile that won't reproduce nfsroot system
autoyast install w/32bit pattern doesn't install 32 bit packages from other selected patterns
autoupgrade fails with empty <script></script> block
Selected Binaries
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