equality constraints.

Intrepid2 MiniTensor: Slight refactor of equality constraint interface
to prepare to accommodate an inequality constraint as in ROL. Propagate
changes to ROL.

Build/Test Cases Summary
Enabled Packages: Intrepid2, ROL
Enabled all Forward Packages
0) MPI_DEBUG => Skipped configure, build, test due to no enabled packages! => Does not affect push readiness! (-1.00 min)
1) SERIAL_RELEASE => Skipped configure, build, test due to no enabled packages! => Does not affect push readiness! (-1.00 min)
2) SERIAL_RELEASE_ST => passed: passed=243,notpassed=0 (20.90 min)