Fix find_input_name_idx bug

[peverwhee]

Resets find_input_name_idx to no_exist_idx after it is modified by const_get_index. Fixes the bug resulted in variables getting a huge <0 index value instead of -1, which caused an error in physics_read_data.

closes #237

Describe any changes made to build system: N/A

Describe any changes made to the namelist: N/A

List any changes to the defaults for the boundary datasets: N/A

Describe any substantial timing or memory changes: N/A

Code reviewed by: nusbaume, mwaxmonsky

List all existing files that have been modified, old files eliminated, new files added and describe the changes:

M src/physics/utils/physics_data.F90

• Reset find_input_name_idx to no_exist_idx after call to const_get_index

M cime_config/config_component.xml

• No longer include chemistry linked libs by default

If there were any failures reported from running test_driver.sh on any test
platform, and check that these failures have been OK'd by the gatekeeper,
then copy the lines from the td.*.status files for the failed tests to the
appropriate machine below. All failed tests must be justified.

derecho/intel/aux_cam
derecho/gnu/aux_cam

All tests pass.

Summarize any changes to answers, i.e.,

what code configurations: N/A
what platforms/compilers: N/A
nature of change (roundoff; larger than roundoff but same climate; new climate): N/A