tests: introduce %CLIENT6IP-NB

This is the %CLIENT6IP variable - but without outmost brackets since
some commmand lines need the address without the brackets. With this
variable we can run three more tests without prechecks.

Closes #15039

tests/data/test1046

@@ -36,12 +36,8 @@ http-ipv6
 HTTP-IPv6 GET with numeric localhost --interface
 </name>
 <command>
--g "http://%HOST6IP:%HTTP6PORT/%TESTNUMBER" --interface ::1
+-g "http://%HOST6IP:%HTTP6PORT/%TESTNUMBER" --interface %CLIENT6IP-NB
 </command>
-# --interface doesn't accept an address surrounded by [] so %CLIENT6IP is out
-<precheck>
-perl -e "print 'Test requires default test client host address' if ( '%CLIENT6IP' ne '[::1]' );"
-</precheck>
 </client>
 
 #

tests/data/test1048

@@ -41,12 +41,8 @@ ftp-ipv6
 FTP-IPv6 dir list PASV with localhost --interface
 </name>
 <command>
--g "ftp://%HOST6IP:%FTP6PORT/" --interface ::1
+-g "ftp://%HOST6IP:%FTP6PORT/" --interface %CLIENT6IP-NB
 </command>
-# --interface doesn't accept an address surrounded by [] so %CLIENT6IP is out
-<precheck>
-perl -e "print 'Test requires default test client host address' if ( '%CLIENT6IP' ne '[::1]' );"
-</precheck>
 </client>
 
 #

tests/data/test1050

@@ -38,12 +38,8 @@ ftp-ipv6
 FTP-IPv6 dir list, EPRT with specified IP
 </name>
 <command>
--g "ftp://%HOST6IP:%FTP6PORT/" -P ::1
+-g "ftp://%HOST6IP:%FTP6PORT/" -P %CLIENT6IP-NB
 </command>
-# --interface doesn't accept an address surrounded by [] so %CLIENT6IP is out
-<precheck>
-perl -e "print 'Test requires default test client host address' if ( '%CLIENT6IP' ne '[::1]' );"
-</precheck>
 </client>
 
 # Verify data after the test has been "shot"