tests: clear the SSL_CERT_FILE variable on --libcurl tests

Otherwise, the contents will end up in the output and fail the
verification.

tests/data/test1400

@@ -27,6 +27,9 @@ http
  <name>
 --libcurl for simple HTTP GET
  </name>
+<setenv>
+SSL_CERT_FILE=
+</setenv>
  <command>
 http://%HOSTIP:%HTTPPORT/we/want/1400 --libcurl log/test1400.c
 </command>

tests/data/test1401

@@ -31,6 +31,9 @@ http
  <name>
 --libcurl for GET with various options
  </name>
+<setenv>
+SSL_CERT_FILE=
+</setenv>
  <command>
 http://%HOSTIP:%HTTPPORT/we/want/1401 --libcurl log/test1401.c --basic -u fake:user -H "X-Files: Mulder" -H "X-Men: cyclops, iceman" -A MyUA -b chocolate=chip --proto "=http,ftp,file"
 </command>

tests/data/test1402

@@ -28,6 +28,9 @@ http
  <name>
 --libcurl for simple POST
  </name>
+<setenv>
+SSL_CERT_FILE=
+</setenv>
  <command>
 http://%HOSTIP:%HTTPPORT/we/want/1402 --libcurl log/test1402.c -d "foo=bar" -d "baz=quux"
 </command>

tests/data/test1403

@@ -28,6 +28,9 @@ http
  <name>
 --libcurl for GET with query
  </name>
+<setenv>
+SSL_CERT_FILE=
+</setenv>
  <command>
 http://%HOSTIP:%HTTPPORT/we/want/1403 --libcurl log/test1403.c -G -d "foo=bar" -d "baz=quux"
 </command>

tests/data/test1404

@@ -29,6 +29,9 @@ http
  <name>
 --libcurl for HTTP RFC1867-type formposting - -F with three files, one with explicit type
  </name>
+<setenv>
+SSL_CERT_FILE=
+</setenv>
  <command>
 http://%HOSTIP:%HTTPPORT/we/want/1404 -F name=value -F 'file=@log/test1404.txt,log/test1404.txt;type=magic/content,log/test1404.txt' --libcurl log/test1404.c
 </command>

tests/data/test1405

@@ -32,6 +32,9 @@ ftp
  <name>
 --libcurl for FTP with quote ops
  </name>
+<setenv>
+SSL_CERT_FILE=
+</setenv>
  <command>
 ftp://%HOSTIP:%FTPPORT/1405 -Q "NOOP 1" -Q "+NOOP 2" -Q "-NOOP 3" -Q "*FAIL" -Q "+*FAIL HARD" --libcurl log/test1405.c
 </command>

tests/data/test1406

@@ -25,6 +25,9 @@ smtp
  <name>
 --libcurl for SMTP
  </name>
+<setenv>
+SSL_CERT_FILE=
+</setenv>
 <file name="log/test1406.eml">
 From: different
 To: another

tests/data/test1407

@@ -26,6 +26,9 @@ pop3
  <name>
 --libcurl for POP3 LIST one message
  </name>
+<setenv>
+SSL_CERT_FILE=
+</setenv>
 <command>
 pop3://%HOSTIP:%POP3PORT/1407 -l -u user:secret --libcurl log/test1407.c
 </command>

tests/data/test1420

@@ -32,6 +32,9 @@ imap
  <name>
 --libcurl for IMAP FETCH message
  </name>
+<setenv>
+SSL_CERT_FILE=
+</setenv>
 <command>
 'imap://%HOSTIP:%IMAPPORT/1420/;UID=1' -u user:secret --libcurl log/test1420.c
 </command>