Also case-insensitive sort all dirs

Test: updater.sh checkall
Change-Id: If0e05cd1cc2acc7834f1c7c59301cefd0ee39eff

As an example, if there is commit C (300 days old) in dev branch. Later dev is merged into upstream-master as commit M (2 days old).

Before this change, the updater will say "2 commits (300 days) behind" because both C and M is not in master.

After this change, it will say "1 commit (2 days) behind", which makes more sense.

(This change raises error when there's no merge base between upstream and master. But I think it is expected)

Test: updater.sh check googletest
Change-Id: I963b378e61677c1f6ea13af0d0f558846040b840

This change computes edit distant between old url and each of new urls.
And use the url most like previous one.

Test: update any library
Change-Id: I959a22168652c7543da2cdb29d36a1d061ade7e9

am: 1c3a4f46

Change-Id: Idec3785b0fc7c33067739c05974733e8291b3e25

Bail out as soon as something goes wrong. Previously if we failed early,
we'd obliterate the existing version anyway.

Don't remove the temporary directory on failure. Otherwise there's no
way to debug a failure.

Bug: N/A
Test: updated external/curl
Change-Id: I3bf055a8ec514c7b76683baee8e1540deb5a3e5d

am: d14f0f99

Change-Id: I1b7216ac7adbe409b92176166ff7a1cc5d09a243

am: 3f73a459

Change-Id: I875dffa2d44073b097d3cd716a6924d4d5b14ce7

Bug: N/A
Test: manual
Change-Id: Ided170a655d5efe5a3026ceb7bd385ed91baa347

Showing the things you need to fix in green was surprising to me.

Errors and successfully determining that a project is stale both deserve
to be red, but use bold so that we can see the projects that need to be
updated even while there are lots of unsupported METADATA files.

Bug: N/A
Test: manual
Change-Id: Idad71a46c675b19d1fa204268c27816375f3e394

am: 24950e79

Change-Id: Iaaed03dbd15f3904be6debcd6da8387640c1e5e7

Add the support to check how far a project is behind upstream git.

Still need to manually run git merge. But this tool can help update
METADATA. :)

Test: ./updater.sh update perf_data_converter
Change-Id: Ic46a0eb723ae22f0fc7d61a67a14299761b564a4

am: dfdda475

Change-Id: I7eb3b9e9ace3d2fef1941dff324845b4791416a4

Bug: 109748616
Test: https://android-review.googlesource.com/c/platform/external/kotlinc/+/699886
Change-Id: I1c28aa256bca6ee5be1ea15f295c5e0fa63526d1