tests: add the timing-dependent keyword on several tests

These are ones likely to fail on heavily-loaded machines that alter the
normal test timing. Most of these tests already had the flaky keyword
since this condition makes them more likely to fail on CI.

tests/data/test1112

@@ -1,4 +1,5 @@
 <testcase>
+# This is the ftps equivalent of test1086
 <info>
 <keywords>
 FTPS
@@ -7,6 +8,7 @@ RETR
 timeout
 FAILURE
 SLOWDOWN
+timing-dependent
 </keywords>
 </info>
 

tests/data/test1206

@@ -46,6 +46,7 @@ SIZE %TESTNUMBER
 RETR %TESTNUMBER
 QUIT
 </protocol>
+10 is CURLE_FTP_ACCEPT_FAILED
 <errorcode>
 10
 </errorcode>

tests/data/test1208

@@ -5,9 +5,10 @@ FTP
 PORT
 RETR
 NODATACONN150
-flaky
 timeout
 FAILURE
+flaky
+timing-dependent
 </keywords>
 </info>
 # Server-side
@@ -53,6 +54,7 @@ TYPE I
 SIZE %TESTNUMBER
 RETR %TESTNUMBER
 </protocol>
+# 28 is CURLE_OPERATION_TIMEDOUT
 <errorcode>
 28
 </errorcode>

tests/data/test1474

@@ -32,6 +32,7 @@ HTTP
 HTTP PUT
 Expect
 flaky
+timing-dependent
 </keywords>
 </info>
 # Server-side

tests/data/test1592

@@ -6,6 +6,7 @@ multi
 resolve
 speedcheck
 flaky
+timing-dependent
 </keywords>
 </info>
 

tests/data/test2032

@@ -5,8 +5,9 @@ HTTP
 HTTP GET
 HTTP Basic auth
 HTTP NTLM auth
-flaky
 NTLM
+flaky
+timing-dependent
 </keywords>
 </info>
 # Server-side

tests/data/test2600

@@ -3,6 +3,7 @@
 <keywords>
 unittest
 cfilter
+timing-dependent
 </keywords>
 </info>