engine: add checkstyle rule LeftCurly

Enable LeftCurly checkstyle rule.
Fix problematic places in code which cause checkstyle
fail due to this rule addition.
Disable this rule in 3 ui packages where there are around 6000
checkstyle violations of this specific rule.

Change-Id: Ia04e86743352f4228eb5ad0ae7e9438f0089ba8f
Signed-off-by: Alissa Bonas <abonas@redhat.com>