Team Config Query Semantics

[jdinan]

Issue

Clarify whether shmem_team_get_config returns the values provided in the config argument during team creation or the current (implementation defined) values for these parameters.

Sub-Issues

Add a SHMEM_TEAM_CONFIG_MASK_ALL compile-time constant to make it easier to query/set all config parameters (for the given ABI that the application was compiled with).

Specify a SHMEM_TEAM_NUM_CONTEXTS_ANY constant that allows the user to specify that they will create contexts, but cannot specify how many.

Ref: jdinan#9

[shamisp]

@jdinan do you see this as 1.5 or 1.6 item ?

[jdinan]

Closed by #521