SSH: Make it configurable whether to check server data pedantically.

While we want to conform to the specs, there are systems out there today
whose SSH servers send non-conforming identifications strings. We now
enable API clients to switch the respecive checks off, and we do so
ourselves in the RemoteLinux plugin, since the only known problems
are with OpenSSH servers.

Change-Id: I9e6f9076f2dc7435a0bde7016f99cfb2fcb30a9c
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/remotelinux/genericlinuxdeviceconfigurationwizard.cpp

@@ -77,6 +77,7 @@ GenericLinuxDeviceConfigurationWizard::~GenericLinuxDeviceConfigurationWizard()
 IDevice::Ptr GenericLinuxDeviceConfigurationWizard::device()
 {
     QSsh::SshConnectionParameters sshParams;
+    sshParams.options &= ~SshConnectionOptions(SshEnableStrictConformanceChecks); // For older SSH servers.
     sshParams.host = d->setupPage.hostName();
     sshParams.userName = d->setupPage.userName();
     sshParams.port = 22;