Replaced spaces with underscores in NS_ consts

Replaced spaces with underscores in NS_ consts

* All $namespaceNames and similar messages
that reference NS_* constants seem to use '_' for spaces,
except a few cases. I suspect its a mistake, thus replacing.

Regexes used:
 ([^'"\n]*['"][^'"\n]*(['"][^'"\n]*['"])*[^'"\n]*[^A-Za-z0-9]NS_)
contains a space in front, replaced with _\1

[^A-Za-z0-9]NS_([^'"\n]*['"][^'"\n]*['"])*[^'"\n]*['"][^'"\n]*
contains a space at the very end, replaced with \1_

Change-Id: Ibbc201678ee91db2b5bf3de597c1598b86558d77