SSH: Set keep-alive timer period to connection timeout.
SSH: Set keep-alive timer period to connection timeout.

The Qt SDK's Qemu can be so slow that a single packet takes more
than the old fixed value of five seconds for a round trip.

Change-Id: I06f442c3c080fec8d1b1d10bd26e2e27b06e6863
Reviewed-on: http://codereview.qt.nokia.com/854
Reviewed-by: Christian Kandeler <3aa99dcdd3f0cac61fb81c2a11771c0cc2497607@nokia.com>

amyvmiwei/qt-creator,xianian/qt-creator,amyvmiwei/qt-creator,colede/qtcreator,martyone/sailfish-qtcreator,danimo/qt-creator,ostash/qt-creator-i18n-uk,darksylinc/qt-creator,malikcjm/qtcreator,AltarBeastiful/qt-creator,colede/qtcreator,darksylinc/qt-creator,maui-packages/qt-creator,KDAB/KDAB-Creator,hdweiss/qt-creator-visualizer,ostash/qt-creator-i18n-uk,martyone/sailfish-qtcreator,maui-packages/qt-creator,xianian/qt-creator,farseerri/git_code,martyone/sailfish-qtcreator,danimo/qt-creator,darksylinc/qt-creator,omniacreator/qtcreator,jonnor/qt-creator,syntheticpp/qt-creator,richardmg/qtcreator,dmik/qt-creator-os2,colede/qtcreator,Distrotech/qtcreator,kuba1/qtcreator,syntheticpp/qt-creator,KDE/android-qt-creator,duythanhphan/qt-creator,ostash/qt-creator-i18n-uk,farseerri/git_code,kuba1/qtcreator,colede/qtcreator,farseerri/git_code,kuba1/qtcreator,danimo/qt-creator,farseerri/git_code,KDE/android-qt-creator,richardmg/qtcreator,dmik/qt-creator-os2,malikcjm/qtcreator,KDE/android-qt-creator,duythanhphan/qt-creator,amyvmiwei/qt-creator,KDE/android-qt-creator,xianian/qt-creator,kuba1/qtcreator,martyone/sailfish-qtcreator,AltarBeastiful/qt-creator,duythanhphan/qt-creator,ostash/qt-creator-i18n-uk,martyone/sailfish-qtcreator,hdweiss/qt-creator-visualizer,omniacreator/qtcreator,KDE/android-qt-creator,xianian/qt-creator,omniacreator/qtcreator,xianian/qt-creator,darksylinc/qt-creator,jonnor/qt-creator,jonnor/qt-creator,xianian/qt-creator,dmik/qt-creator-os2,hdweiss/qt-creator-visualizer,dmik/qt-creator-os2,farseerri/git_code,amyvmiwei/qt-creator,dmik/qt-creator-os2,Distrotech/qtcreator,jonnor/qt-creator,Distrotech/qtcreator,darksylinc/qt-creator,bakaiadam/collaborative_qt_creator,azat/qtcreator,maui-packages/qt-creator,AltarBeastiful/qt-creator,kuba1/qtcreator,azat/qtcreator,danimo/qt-creator,colede/qtcreator,syntheticpp/qt-creator,amyvmiwei/qt-creator,KDAB/KDAB-Creator,bakaiadam/collaborative_qt_creator,Distrotech/qtcreator,bakaiadam/collaborative_qt_creator,KDAB/KDAB-Creator,malikcjm/qtcreator,colede/qtcreator,malikcjm/qtcreator,kuba1/qtcreator,ostash/qt-creator-i18n-uk,duythanhphan/qt-creator,malikcjm/qtcreator,darksylinc/qt-creator,richardmg/qtcreator,omniacreator/qtcreator,farseerri/git_code,hdweiss/qt-creator-visualizer,danimo/qt-creator,xianian/qt-creator,duythanhphan/qt-creator,dmik/qt-creator-os2,omniacreator/qtcreator,martyone/sailfish-qtcreator,duythanhphan/qt-creator,Distrotech/qtcreator,AltarBeastiful/qt-creator,amyvmiwei/qt-creator,duythanhphan/qt-creator,darksylinc/qt-creator,Distrotech/qtcreator,AltarBeastiful/qt-creator,omniacreator/qtcreator,KDE/android-qt-creator,darksylinc/qt-creator,martyone/sailfish-qtcreator,maui-packages/qt-creator,richardmg/qtcreator,omniacreator/qtcreator,martyone/sailfish-qtcreator,kuba1/qtcreator,azat/qtcreator,kuba1/qtcreator,ostash/qt-creator-i18n-uk,farseerri/git_code,KDE/android-qt-creator,richardmg/qtcreator,hdweiss/qt-creator-visualizer,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,bakaiadam/collaborative_qt_creator,azat/qtcreator,maui-packages/qt-creator,azat/qtcreator,KDAB/KDAB-Creator,malikcjm/qtcreator,danimo/qt-creator,syntheticpp/qt-creator,dmik/qt-creator-os2,syntheticpp/qt-creator,AltarBeastiful/qt-creator,maui-packages/qt-creator,farseerri/git_code,syntheticpp/qt-creator,colede/qtcreator,kuba1/qtcreator,amyvmiwei/qt-creator,KDAB/KDAB-Creator,AltarBeastiful/qt-creator,bakaiadam/collaborative_qt_creator,hdweiss/qt-creator-visualizer,richardmg/qtcreator,ostash/qt-creator-i18n-uk,amyvmiwei/qt-creator,xianian/qt-creator,KDAB/KDAB-Creator,malikcjm/qtcreator,jonnor/qt-creator,KDE/android-qt-creator,azat/qtcreator,xianian/qt-creator,bakaiadam/collaborative_qt_creator,jonnor/qt-creator,syntheticpp/qt-creator,maui-packages/qt-creator,danimo/qt-creator,richardmg/qtcreator,danimo/qt-creator,bakaiadam/collaborative_qt_creator,danimo/qt-creator,Distrotech/qtcreator