Bump ubuntu from `b359f10` to `ab64a83` in /docker/seacas #848

Job	Run time
build-deps (gnu, 4.9.2)	24s
build-deps (clang, 4.9.2)	27s
build-deps (mpi, 4.9.2)	36s
Debug serial build	4m 26s
Debug parallel build	4m 50s
Use modern CMake configure of netCDF package	6m 12s
	16m 55s

Provide feedback