Add ability to bypass check for argcomplete via configfiles

[ryran]

So that people who don't want it don't have to see this message on stderr at every startup:

Missing optional python module: argcomplete
Install it to enable bash auto-magic tab-completion:
  yum/dnf install python-pip; pip install argcomplete
  activate-global-python-argcomplete; (Then restart shell)

[ryran]

The message now reads:

~]$ rhsecapi
Missing optional python module: argcomplete

  To enable bash auto-magic tab-completion, install it:
    yum/dnf install python-pip
    pip install argcomplete
    activate-global-python-argcomplete
    (Open new shell)

  To skip using argcomplete AND disable future printing of this message:
    touch ~/.rhsecapi-no-argcomplete
      OR
    touch /etc/rhsecapi-no-argcomplete

usage: rhsecapi [--q-before YYYY-MM-DD] [--q-after YYYY-MM-DD] [--q-bug BZID]
                [--q-advisory RHSA] [--q-severity IMPACT] [--q-package PKG]
                [--q-cwe CWEID] [--q-cvss SCORE] [--q-cvss3 SCORE] [--q-empty]
                [--q-pagesize PAGESZ] [--q-pagenum PAGENUM] [--q-raw RAWQUERY]
                [--q-iava IAVA] [-s] [-0] [-f FIELDS] [-a] [-m] [-p PRODUCT]
                [-j] [-u] [-w [WIDTH]] [-c] [-l {debug,info,notice,warning}]
                [-t THREDS] [-P] [-E [DAYS]] [--dryrun] [-h] [--help]
                [CVE-YYYY-NNNN [CVE-YYYY-NNNN ...]]

Run rhsecapi --help for full help page

VERSION:
  rhsecapi v1.0.0_rc6 last mod 2016/11/24
  See <http://github.com/ryran/rhsecapi> to report bugs or RFEs

Yay!

[ryran]

The message now reads:

~]$ rhsecapi
Missing optional python module: argcomplete

  To enable bash auto-magic tab-completion, install it:
    yum/dnf install python-pip
    pip install argcomplete
    activate-global-python-argcomplete
    (Open new shell)

  To skip using argcomplete AND disable future printing of this message:
    touch ~/.rhsecapi-no-argcomplete
      OR
    touch /etc/rhsecapi-no-argcomplete

usage: rhsecapi [--q-before YYYY-MM-DD] [--q-after YYYY-MM-DD] [--q-bug BZID]
                [--q-advisory RHSA] [--q-severity IMPACT] [--q-package PKG]
                [--q-cwe CWEID] [--q-cvss SCORE] [--q-cvss3 SCORE] [--q-empty]
                [--q-pagesize PAGESZ] [--q-pagenum PAGENUM] [--q-raw RAWQUERY]
                [--q-iava IAVA] [-s] [-0] [-f FIELDS] [-a] [-m] [-p PRODUCT]
                [-j] [-u] [-w [WIDTH]] [-c] [-l {debug,info,notice,warning}]
                [-t THREDS] [-P] [-E [DAYS]] [--dryrun] [-h] [--help]
                [CVE-YYYY-NNNN [CVE-YYYY-NNNN ...]]

Run rhsecapi --help for full help page

VERSION:
  rhsecapi v1.0.0_rc6 last mod 2016/11/24
  See <http://github.com/ryran/rhsecapi> to report bugs or RFEs

Yay!