* Update docs/submodules/releng-xci from branch 'master'
- Merge "Combine vars setting installer type in INSTALLER_TYPE"
- Combine vars setting installer type in INSTALLER_TYPE
Change-Id: I330bc036f901d4ba61bc94ee6e085cadf54b4d8b Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>