New option `--print-digest`/`-p` for `cf-key`.

With the new option it is possible to print the default CFEngine
digest value for a given public key file.
New option `--trust-key`/`-t` for `cf-key`.

This new option copies the given public key file
to the file name where `cf-serverd` would have stored
it if it had been gotten as the result of a successful
network exchange.

Such an option is intended to be used in fully-automated
installs, when there is a trusted way of deploying client
keys on the server and vice-versa.

  modified:   cf-key.c
fix: avoid class name clash

The problem appended in this case:
if set_variable_values is used two time in a row in the same bundle
  and
    if the same key name is used

For example, in this case NM_CONTROLLED_in_file was defined for the first
file and the key was ignored for the second file.

"ifcfgeth0[BRIDGE]" string => "br0";
"ifcfgeth0[NM_CONTROLLED]" string => "no";

"ifcfgbr0[NM_CONTROLLED]" string => "no";

files:
    "/etc/sysconfig/network-scripts/ifcfg-eth0"
      edit_line => set_variable_values("app_srvkvm_set_up_bridge.ifcfgeth0");

files:
    "/etc/sysconfig/network-scripts/ifcfg-br0"
      edit_line => set_variable_values("app_srvkvm_set_up_bridge.ifcfgbr0");
Standardize, remove constraints.h. Moved into policy.h
Free the dup'd string.
Remove EscapeJson
Move AgentTypeToString from conversion to generic_agent
Standardize enum cfmeasurepolicy -> MeasurePolicy
Standardize enum cfenvironment_state -> EnvironmentState
Rename String2InsertMatch -> InsertMatchTypeFromString
Standardize enum cfinterval -> Interval
Standardize enum cfdbtype -> DatabaseType
Rename String2ReportLevel -> OutputLevelFromString
Standardize enum cfcomparison -> FileComparator
Standardize enum cflinktype -> FileLinkType
Free more dup'd strings.
Removing unused variables.
Fix make check for out-of-tree builds.
Merge pull request #360 from cduclos/master

Remove unused variables
Rename Typename2Datatype -> DataTypeFromString