Re-arrange common.h to match the ordering in common.c
Re-arrange common.h to match the ordering in common.c

Signed-off-by: Chris Lalancette <60b62644009db6b194cc0445b64e9b27bb26433a@redhat.com>

ike-dai/libdeltacloud-for-cloudmodule,ike-dai/libdeltacloud-for-cloudmodule