Security update for gnome-shell

This update for gnome-shell provides the following fixes:

- Fix not intuitive login screen for root user (bsc#1047262)
- Disable session selection button when it's hidden in user switch dialog (bsc#1034584, bsc#1034827)
- Fix app windows overlay app list in overview screen (bsc#1008539)
- Properly handle failures when loading extensions (bsc#1036494, CVE-2017-8288)

This update was imported from the SUSE:SLE-12-SP2:Update update project.

Fixed bugs
bnc#1034584
In GDM login window, GNOME sessions should not be allowed to select when inputting username.
bnc#1034827
In GDM Switch User window , GNOME sessions should not be allowed to select.
bnc#1008539
RC2: Gnome applications list is going underneath activities overview
bnc#1047262
"not listed" Login screen for root user is not intuitive
bnc#1036494
VUL-0: CVE-2017-8288: gnome-shell: mishandles extensions that fail to reload
Selected Binaries
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