Calls ProcessInfo::readArguments periodically on ProcessInfo::update

When ssh is run via 'exec ssh [ssh arguments]', ProcessInfo::_arguments
is not updated since ProcessInfo::readArguments is only called once when
the process is started. Thus, SSHProcessInfo::SSHProcessInfo will have
soft errors since it relies heavily on reading ProcessInfo::_arguments
which are outdated. A solution is to call ProcessInfo::clearArguments
followed by ProcessInfo::readArguments whenever ProcessInfo::update
is called if there is a change in process name.

src/NullProcessInfo.cpp

@@ -27,6 +27,11 @@ bool NullProcessInfo::readCurrentDir(int /*pid*/)
     return false;
 }
 
+bool NullProcessInfo::readArguments(int /*pid*/)
+{
+    return false;
+}
+
 void NullProcessInfo::readUserName()
 {
 }