tests: tweak lock file handling and timers

- when server are killed by a test case, do not wait for the server lock
  file to go away. These tests are mostly about client timeouts and the
  server will hang until killed.
- when killing a server successfully, check for a remaining lock file,
  log its existence and remove it.
- lower the delay timings on SLOWDOWN by half
- add SLOWDOWNDATA server command to only slow down the FTP data bytes,
  not the control ones.
- lower some timeout values

Closes #14835

tests/data/test1086

@@ -6,7 +6,7 @@ EPSV
 RETR
 timeout
 FAILURE
-SLOWDOWN
+SLOWDOWNDATA
 flaky
 timing-dependent
 </keywords>
@@ -14,10 +14,8 @@ timing-dependent
 
 # Server-side
 <reply>
-# Overload some standard FTP responses to make them shorter and faster
-# to avoid wasting time waiting for the data phase to start
 <servercmd>
-SLOWDOWN
+SLOWDOWNDATA
 REPLY welcome 220 Hey
 REPLY USER 331 OK
 REPLY PASS 230 OK
@@ -90,7 +88,7 @@ ftp
 FTP download with strict timeout and slow data transfer
 </name>
 <command>
-ftp://%HOSTIP:%FTPPORT/%TESTNUMBER -m 7
+ftp://%HOSTIP:%FTPPORT/%TESTNUMBER -m 5
 </command>
 </client>
 

tests/data/test1112

@@ -7,17 +7,15 @@ EPSV
 RETR
 timeout
 FAILURE
-SLOWDOWN
+SLOWDOWNDATA
 timing-dependent
 </keywords>
 </info>
 
 # Server-side
 <reply>
-# Overload some standard FTP responses to make them shorter and faster
-# to avoid wasting time waiting for the data phase to start
 <servercmd>
-SLOWDOWN
+SLOWDOWNDATA
 REPLY welcome 220 Hey
 REPLY USER 331 OK
 REPLY PASS 230 OK
@@ -93,7 +91,7 @@ ftps
 FTPS download with strict timeout and slow data transfer
 </name>
 <command>
--k --ftp-ssl-control ftps://%HOSTIP:%FTPSPORT/%TESTNUMBER -m 16
+-k --ftp-ssl-control ftps://%HOSTIP:%FTPSPORT/%TESTNUMBER -m 5
 </command>
 </client>
 

tests/data/test29

@@ -26,6 +26,9 @@ wait 10
 <server>
 http
 </server>
+<killserver>
+http
+</killserver>
 <name>
 HTTP with 2 secs timeout
 </name>