updating about pods and about clusters

Signed-off-by: Sebastien Goasguen <runseb@gmail.com>
correcting componentContext.xml references

Signed-off-by: Sebastien Goasguen <runseb@gmail.com>
correcting password management script download links

Signed-off-by: Sebastien Goasguen <runseb@gmail.com>
fix little trailing whitespace issue
CLOUDSTACK-5003
CLOUDSTACK-5127
release notes for 4.2.1 CLOUDSTACK-5125
CLOUDSTACK-4708
CLOUDSTACK-5127
CLOUDSTACK-5129 UCS
updated Book info file, Release notes for 4.2.1 release
added steps for getting new templates in upgrade section
adding list of fixed issues
upgrade 4.2 to 42.1 is in progress
more steps have been added on verifying the artifacts
fixed many XML DTD errors
CLOUDSTACK-5298
added release-notes/en-US/fallback.xml and optimized
release-notes/en-US/Preface.xml
build issues finally resolved. thanks to Sebgoa for the help
edited known issues and fixed issues sections