Remove trailing quote in code definition.

* Testing
build successful
cmake .. && cmake --build .

This patch completes the definition of new error code
TSDB_CODE_DND_VNODE_OPEN_FAILED.

This patch fixes a few error handling of memory allocation
failure while opening vnodes.

bonus fix: also add a new error code to indicate failure
of opening vnode. Before the patch, the function would simply
return -1 when vnode open fails.

crash.

fix typo in comment

user pass timestamp precision for line protocol, openTSDB related
timestamp accpet only 10 digits(second) or 13 digits(millisecond) by
default

to binary/nchar through smlDefaultJSONStrType param