config: fix specifying configuration value with equality sign

Currently there is a problem with parse_config_section() when the
configuration value contains equality sign like this for example:

MOUNT_OPTIONS="-o data=journal"

the result will be

export MOUNT_OPTIONS="-o data="journal"

which is not going to work. The reason is that the expression used to
parse the configuration options uses greedy matching '.*'. Fix this by
using non greedy expression to match the first equality sign '[^=]'.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

common/config

@@ -349,7 +349,7 @@ parse_config_section() {
 		-e 's/#.*$//' \
 		-e 's/[[:space:]]*$//' \
 		-e 's/^[[:space:]]*//' \
-		-e "s/^\(.*\)=\"\?'\?\([^\"']*\)\"\?'\?$/export \1=\"\2\"/" \
+		-e "s/^\([^=]*\)=\"\?'\?\([^\"']*\)\"\?'\?$/export \1=\"\2\"/" \
 		< $HOST_OPTIONS \
 		| sed -n -e "/^\[$SECTION\]/,/^\s*\[/{/^[^#].*\=.*/p;}"`
 }