[lib][unittest] Shrink string usage in macros.
[lib][unittest] Shrink string usage in macros.

The various EXPECT_EQ, etc., macros used concatenation to build
their strings.  This creates a full error string for each
EXPECT_* test in a unittest.  Instead, use string substitution
(%s) so that the common portions of the strings can be
combined.

Change-Id: I6d8d39027dc1b6462913bdab2e47c567bf99350f

sndnvaps/lk,littlekernel/lk,hollanderic/lkstuff,travisg/lk,travisg/lk,minglun-tsai/lk,minglun-tsai/lk,sndnvaps/lk,ErikCorryGoogle/lk,hollanderic/lkstuff,minglun-tsai/lk,ErikCorryGoogle/lk,hollanderic/lkstuff,sndnvaps/lk,minglun-tsai/lk,sndnvaps/lk,travisg/lk,littlekernel/lk,ErikCorryGoogle/lk,littlekernel/lk,sndnvaps/lk,ErikCorryGoogle/lk,hollanderic/lkstuff,littlekernel/lk,travisg/lk