~xdavidwu/saf-cephfs

tree: remove ceph.patch

this is unused since pacific rebase, which source is hosted in a new
standalone repo
DocumentsProvider: unify metadata row building

this also fix a case where full path are taken as display names
DocumentsProvider: simplify logging and toasting
Revert "CephMount: add missing IOException throw to mount()"

This reverts commit 3cc32c4928758dbbd559ddf85d419bda28721b4a.

Unneeded modification after 7eb7507da84e9c9405f4b8149e61378594c205aa
DocumentsProvider: wrap remaining mount() to throw IOE
CephFSDocumentsProvider: simplify mount setup handling
CephFSDocumentsProvider: improve log messages
add editorconfig
CephFSDocumentsProvider: root: improve naming

make title shorter, and move cephfs string to summary, which makes it
friendlier to stock DocumentsUI with phone screen
jni: update prebuilts from ceph v16.2.7 rebase, un-lfs

newer ndk r23.b toolchain seems to produce a lot smaller binaries, and
we can now get rid of lfs. old binraries are branched at
old-prebuilts-lfs branch on github.
build: require sdk runtime minimum 24

this restriction actually already exists for a long time, from libceph*
libraries. ceph needs:

ns_* from arpa/nameser.h, __INTRODUCED_IN_64(22)
{get,free}ifaddrs from ifaddrs.h,  __INTRODUCED_IN(24)
CephFSDocumentsProvider: lookup mime-type on symlinks
build: use maven central instead of jcenter
make mount timeout configurable
DocumentsProvider: toast and unset global handle on mount errors
update build toolset
update prebuilt ceph libs to pacific
DocumentsProvider: setup ceph only when needed
DocumentsProvider: set ceph mount timeout to 20

DocumentsUI on Pixels seems to have a timeout of 20.
Default timeout of 300 is too long, let's make it 20 for now.
To be configurable in future.
DocumentsProvider: unmount before new mount
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