Explicitly mention every options in .clang-format to protect us from possible
future changes.

Remove separate InnoDB style.

Change style to look more like this script:
for x in $@
do
 indent -kr -bl -bli0 -l79 -i2 -nut -c48 -dj -cp0 $x
 sed -ri -e 's/ = /= /g'\
         -e '/switch.*\)$/{N;s/\n[ ]+/ /}' $x
done

Significant different is that 'switch' and '{' are put on different lines
because it's impossible in clang-format to set formatting rules just for
'switch' statement.