exmdb, emsmdb: enable softdelete by default

Historically, Gromox could only do harddeletes in private stores.
Since about gromox-2.0-76-g9c860fca2, private stores are able to
record such a "softdelete" flag. The default configuration was still
set to exmdb_private_folder_softdelete=0, i.e. all requests for
object soft deletion would be treated as hard deletions. Except: that
did not consistently happen, and private stores could amass softdel
messages even if disabled by the admin. The situation only changed
with gromox-2.48-120-gcc78fbdfa where this defect was closed; since
then, exmdb_private_folder_softdelete=0 meant harddeletes.

In other words, softdel was exercised by the userbase already (even
if by accident) and since cc78fbd, that seemed to no longer work.
Change the default config setting for softdeletions for real now.

(This influences a future development, which now has to consider the
presence of Gromox-2.0-style softdel messages. That's all.)

References: GXL-362

Author: jengelh

doc/exchange_emsmdb.4gx

@@ -90,7 +90,7 @@ Enables soft-delete support for folders in private stores. (This feature is
 experimental.) Public folders always have this on. (Take note that
 exmdb_provider.cfg:exmdb_private_folder_softdelete also need to be enabled.)
 .br
-Default: \fIno\fP
+Default: \fIyes\fP
 .TP
 \fBemsmdb_rop_chaining\fP
 0: Deactivate ROP chaining. 1: Enable ROP chaining for OL < 15 and OL >=

doc/exmdb_provider.4gx

@@ -110,7 +110,7 @@ Default: \fI2\fP
 Enables soft-delete support for folders in private stores. (This feature is
 experimental.) Public folders always have this on.
 .br
-Default: \fIno\fP
+Default: \fIyes\fP
 .TP
 \fBexmdb_schema_upgrades\fP
 This directive controls whether database schemas are automatically upgraded

exch/emsmdb/main.cpp

@@ -58,7 +58,7 @@ static constexpr cfg_directive emsmdb_cfg_defaults[] = {
 	{"ems_max_pending_sesnotif", "1K", CFG_SIZE, "0"},
 	{"emsmdb_max_cxh_per_user", "100", CFG_SIZE, "100"},
 	{"emsmdb_max_obh_per_session", "500", CFG_SIZE, "500"},
-	{"emsmdb_private_folder_softdelete", "0", CFG_BOOL},
+	{"emsmdb_private_folder_softdelete", "1", CFG_BOOL},
 	{"emsmdb_rop_chaining", "1"},
 	{"mailbox_ping_interval", "5min", CFG_TIME, "60s", "1h"},
 	{"max_ext_rule_length", "510K", CFG_SIZE, "1"},

exch/exmdb/main.cpp

@@ -54,7 +54,7 @@ static constexpr cfg_directive exmdb_cfg_defaults[] = {
 	{"exmdb_max_sqlite_spares", "3", CFG_SIZE},
 	{"exmdb_pf_read_per_user", "1"},
 	{"exmdb_pf_read_states", "2"},
-	{"exmdb_private_folder_softdelete", "0", CFG_BOOL},
+	{"exmdb_private_folder_softdelete", "1", CFG_BOOL},
 	{"exmdb_schema_upgrades", "auto"},
 	{"exmdb_search_nice", "0"},
 	{"exmdb_search_pacing", "250", CFG_SIZE},