Uniformly escape shell arguments.

Arguments with embedded spaces need to be wrapped in quotes, which
changes the overall escaping strategy.  Instead of mixing the two
strategies, just always wrap arguments in quotes.

(cherry-pick of fd546e8c35341b518873eb4f883afbed92e947af.)

Bug: 15479704
Change-Id: I03eacfa1bd6c220d4ec6617b825ebb0c43c7221e
1 file changed