tests: more significant names for some tests

* t/spy.sh: Rename...
* t/spy-double-colon.sh: ... like this.
* t/yacc4.sh: Rename...
* t/yacc-misc.sh: ... like this.
* t/yaccdry.sh: Rename...
* t/yacc-dry.sh: ... like this.
* t/yaccpp.sh: Rename...
* t/yacc-cxx-grepping.sh: ... like this.
* t/yaccvpath.sh: Rename...
* t/yacc-vpath.sh: ... like this.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

t/list-of-tests.mk

@@ -991,7 +991,7 @@ t/spell.sh \
 t/spell2.sh \
 t/spell3.sh \
 t/spelling.sh \
-t/spy.sh \
+t/spy-double-colon.sh \
 t/spy-rm.tap \
 t/stdinc.sh \
 t/stamph2.sh \
@@ -1236,10 +1236,10 @@ t/werror3.sh \
 t/werror4.sh \
 t/whoami.sh \
 t/xsource.sh \
-t/yacc4.sh \
-t/yaccdry.sh \
-t/yaccpp.sh \
-t/yaccvpath.sh \
+t/yacc-misc.sh \
+t/yacc-dry.sh \
+t/yacc-cxx-grepping.sh \
+t/yacc-vpath.sh \
 t/yacc-auxdir.sh \
 t/yacc-basic.sh \
 t/yacc-cxx.sh \