TS-2499: header_rewrite: fixed value substitution

This commit fixes substitution of following variables in add header:
    %<cquup>
    %<cqhm>
    %<cqhl>
    %<chi>
    %<port>
    %<proto>

Pointy hat to: me (rbtz@)
Added TS-2499 to CHANGES> This fixes #33.
TS-2499 Anal indentation changes.
TS-2500 Fix cache stripe assignment due to failed disk.
[TS-1648] Segmentation fault in dir_clear_range()
[TS-1648] Segmentation fault in dir_clear_range()
TS-2507: fix the state transition logging for handle_server_setup_error

STATE_ENTER should take a VC event code, not a HttpApiState_t. Also,
STATE_ENTER is conventionally called on entry to the state handler,
not somewhere in the middle.
TS-2508: escalation plugin

The escalation plugin is intended to allow Traffic Server to handle
origin errors by rerouting to a different URL. This doesn't currently
work, since the APIs it uses cause crashes. In it's current form,
it should be useful as a test case to work on fixing the APIs.
TS-2509: add const qualifier to pure HttpTunnel member functions
TS-799 Have AdminClient.pm created from .in file
TS-2504: replace OpenSSL detection with AX_CHECK_OPENSSL

Use the ax_check_openssl.m4 macro from the autoconf archive so that
we don't need to carry around custom OpenSSL detection logic.
TS-2504: detect OpenSSL library in 64 bit library paths
TS-2504: fix bad OpenSSL lib64 detection patch merge
TS-2305: fall back to ftruncate on posix_fallocate failure
TS-2505 Add --offline to traffic_line
TS-2521: add stub for hacking documentation
TS-1668: Updated the documentation for HSTS
Reorder the build subdirs, such that all code compiles first
TS-2419: Don't close client connection when responding with a 204 and
there is no body - Fixed a bug when the 204 is served by cache
Reorder the build subdirs, such that all code compiles first