Fix crash when downloading from Catalog.

The cause of this crash is fixed in Poco 1.4.0 by this commit:
http://poco.svn.sourceforge.net/viewvc/poco/poco/branches/poco-1.4.0/NetSSL_OpenSSL/src/SecureSocketImpl.cpp?r1=1426&r2=1428&pathrev=1428

However, Ubuntu 14.04 is only shipping 1.3.6, so all we can do is
side-step the crash.

Refs #10122.
Merge remote-tracking branch 'origin/feature/10122_crash_in_reflectometry_ui'