fixed product regexp to allow pattern based upgrade

from SLED11 (bnc#871174)

- 12.0.16
Merge pull request #19 from yast/pattern_based_upgrade

fixed product regexp to allow pattern based upgrade
Adapted SW upgrade behavior to SLED12
New changes file entry and new version
Merge pull request #20 from kobliha/sle12_upgrade

Adapted software upgrade behavior to SLED 12 (bnc#871174)
setup network for upgrade workflow (bnc#871178)
release
Merge pull request #21 from yast/network_in_upgrade

Network in upgrade
clean up bootloader update with old obsolete stuff (bnc#872081)
release
improve changelog message
Linked to the documentation of control.xml
Merge pull request #22 from yast/boot_upgrade

Boot upgrade
propose new bootloader configuration due to migration to grub2
release
Merge pull request #23 from yast/bootloader_update

Bootloader update