nodeid and inode number used to be identical, which is
why both could be marked as "iXXX". This is no longer the
case, so make nodeids distinguishable.

Example:

23:47:17.637736 rx 9156: MKDIR n28 {0777 (00)} ["d90X"] 5b
23:47:17.637801 tx 9156:     OK, {n112 g1 tE=1s tA=1s {M040755 SZ=4096 L=2 1026:1026 B8*4096 i0:2769795 A 1601761637.637385 M 1601761637.637385 C 1601761637.637385}}

v4: also update orphaned inode warning

Change-Id: Ib29dabfd4cf6692cf4118191f8dc73529562426f